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The airborne concentrations of substances (such as H2S) under which nearly all workers may be repeatedly exposed without adverse effects are called（）.
A . exposure limits
B . concentration limits
C . threshold limit values
D . substance limit value
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If you are guilty of failure to properly perform your duties as Operator of Uninspected Towing Vessels，which of the following actions may NOT be taken? （）
A . Issuance of a letter of warning
B . Suspension of your license
C . Revocation of your license
D . A fine placed against your license
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You want to compress your folder named test on a FAT32 file system. When you try to compress the folder， you found no advance tab in the folder’s property window. What may be its reason.（）
A . You are not an administrator
B . A local system policy is implemented to hide the advance tab
C . FAT32 does not support compression
D . Delete and recreate the testing folder
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A ship must have a self-contained breathing apparatus to be used as protection from gas leaking from a refrigeration unit. To meet this requirement，you may use（）.
A . a gas mask certified by the Mine Safety and Health Administration
B . the same self-contained breathing apparatus required with the fireman's outfit
C . an oxygen breathing apparatus，provided that the device has been inspected within three years
D . a portable ventilation system that will provide a complete change of air every three minute
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When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
A . 10 meters
B . 20 meters
C . 50 meters
D . 100 meter
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If they mean to you（）they mean to me, they may perhaps be helpful also to our sons for their guidance and inspiration.
A . who
B . what
C . that
D . just a
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A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.
A . damage from crane operations
B . being used for wash down purposes
C . accidental diversion of flow to wrong location
D . freezing
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If，after examination by the Quarantine Officer，your vessel is found to have a specific deficiency，you may be issued（）.
A . Bill of health
B . Free Pratique
C . Notice to Comply
D . Controlled Free Pratique
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If you are the stand-on vessel in a crossing situation，you may take action to avoid collision by your maneuver alone. When may this action be taken?（）.
A . At any time you feel it is appropriate
B . Only when you have reached extremis
C . When you determine that your present course will cross ahead of the other vessel
D . When it becomes apparent to you that the give-way vessel is not taking appropriate actio
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In Turkey, when visiting someone in their home, be careful not to compliment your host on something or it may be given to you as a gift.
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You may not be able to accomplish it by yourself. Remember ______.
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原文:Remember you may be taken to court for not doing so, and you may be fined if you cannot prove to the court that you have been excused from wearing it.译文:注意你如果不这么做(系安全带)的话,你有可能被告上法庭,而且你有可能被处以_______,除非你能证明你有不带安全带的理由.
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We are sure that our new products may be ______ particular interest to you.
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If you add enough insulation to your house, you may be able to________.
A．improve your work environment
B．cut your utility bills by half
C．get rid of air-conditioners
D．enjoy much better health
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A meager diet may give you health and long life, but it's not much fun—and it might not even be necessary. We may be able to hang on to most of that youthful vigor even if we don't start to diet until old age.
Stephen Spindler and his colleagues from the University of California at Riverside have found that some of an elderly mouse's liver genes can be made to behave as they did when the mouse was young simply by limiting its food for four weeks. The genetic rejuvenation won't reverse other damage caused by time for the mouse, but could help its liver metabolize drugs or get rid of toxins.
Spindler's team fed three mice a normal diet for their whole lives, and fed another three on half-rations. Three more mice were switched from the normal diet to half-feed for a month when they were 34 months old—equivalent to about 70 human years.
The researchers checked the activity of 11,000 genes from the mouse livers, and found that 46 changed with age in the normally fed mice. The changes were associated with things like inflammation and free radical production—probably bad news for mouse health. In the mice that had dieted all their lives, 27 of those 46 genes continued to behave like young genes. But the most surprising finding was that the mice that only started dieting in old age also benefited from 70 percent of these gene changes.
"This is the first indication that these effects kick in pretty quickly," says Huber Warner from the National Institute on Aging near Washington, D.C..
No one yet knows if calorie restriction works in people as it does in mice, but Spindler is hopeful. "There's attracting and tempting evidence out there that it will work," he says.
If it does work in people, there might be good reasons for rejuvenating the liver. As we get older, our bodies are less efficient at metabolizing drugs, for example. A brief period of time of dieting, says Spindler, could be enough to make sure a drug is effective.
But Spindler isn't sure the trade-off is worth it. "The mice get less disease, they live longer, but they're hungry," he says. "Even seeing what a diet does, it's still hard to go to a restaurant and say: 'I can only eat half of that'."
Spindler hopes we soon won't need to diet at all. His company, Life Span Genetics in California, is looking for drugs that have the effects of calorie restriction.
According to the passage, which of the following is NOT true？
A．Eating less than usual might make us live longer.
B．If we go on a diet when old, we may keep healthy.
C．Dieting might not be needed. ~
D．We have to begin dieting from childhood.
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— May I speak to Prof . Li please？
—（）.
A．There's no Prof. Li
B．I'm afraid you've got the wrong number
C．No, you can't
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短语be exposed to 的含义是（)。
A．遭受
B．应该
C．反对
D．处理
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When Mr. Bennet said to his wife: "Mr. Bingley may like you the best of the party", he intended to be______.
A．sympathetic
B．ironical
C．supportive
D．critical
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Man: Did you see Martha just now？ I want to ask her to go with us to the concert tonight. Woman: She must be around somewhere. You may still be able to catch her. Question: What does the woman mean？
A．She knows where Martha has gone.
B．Martha will go to the concert by herself.
C．It is quite possible for the man to find Martha.
D．The man is going to meet Martha at the concert.
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When traveling, it is possible that you may be advised to take the travelers' checks, which provide a secure ________ to carrying your money in cash.
A．selection
B．preference
C．alternative
D．substitute
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听力原文：M: Have you heard that in another few years you may be able to buy a car that changes colors every day to match the outfit you are wearing？
W: Oh, please be serious! I suppose they will change shapes as well. If you want a big car to take all your friends camping, I suppose you'll just be able to snap your fingers and make it happen. Or if you want a sporty two-seater, you could just tell the car what you wanted, and it would do the rest. Is that how it will work？
M: No, I am serious. They have found a way to alter the surface of metals so that they can reflect different colors just by passing a small amount of electricity over them.
W: Oh, I see. So anything that touches the outside of the car will get a shock. That sounds lovely.
M: It's only a tiny amount of electricity. It wouldn't be enough to shock anybody.
W: Well, it sounds pretty difficult to believe.
M: Yes, it's quite amazing. The important thing you have to remember is that the color of an object is really just an illusion created by the way light bounces off its surface. Engineers have been able to produce a car that changes colors at the touch of a button by slightly rearranging the position of the particles on the surface of the metal.
W: It sounds so amazing. But I guess it could be possible.
M: It is possible today. The only problem is that it is very expensive. To produce a car with a surface that changed colors would cost almost twice as much as what a regular car costs. For that much money you could just by the car and have it repainted twenty times, so it's not very practical yet.
W: Yes, but in other ways it could be more practical. If you took your car to be painted twenty times, it would use quite a bit of polluting chemicals, and it would take a long time.
M: You're right there, but how many people really get their car repainted that many time？
W: Hmm, I suppose you're right, but I sure would love to have my car match my outfit every day.
(26)
A．She is impressed.
B．She is doubtful.
C．She is shocked.
D．She is surprised.
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Periodically, we may send you information about our various products which we feel may be_______to you.
A．interest
B．of interest
C．interested
D．interestingly
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“May I have the honor to invite you to be my guest at today’s banquet.” is an informal expression to invite friends to dinner.
A:正确;
B:错误
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The hospital may have exposed the patients to the viruses, because
A．they tried to protect their delicate instruments.
B．they didn"t follow the policy accordingly.
C．they didn"t know how to follow the policy sometimes.
D．they have good intentions but the end result is bad.
