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Since many insects have already become（）to DDT, scientists have to look for some new insecticide
A、active
B、resistant
C、tough
D、gradual
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Over（）science parks have been set up by higher education institutions in conjunction with industrial scientists and technologists.
A . 10
B . 20
C . 30
D . 40
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Many scientists remain ________ about the value of this research program.
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One symbol may have many meanings.
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Scientists have to _______ past experiences in making new ideas.
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How
many children does Phil have?
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According to the passage, scientists have discovered that influenza viruses_____.
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Scientists have invented a robot which can cook for people. Nowadays, science and technology______ every aspect of our lives.
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Many families have their own cars.
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Have scientists found of water on Mars?
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Great as Newton was, many of his ideas _______today and are being modified by the work of scientists of our time.
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________ the calculation is right， scientists can never be sure that they have included all variables and modeled them accurately.
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听力原文： Scientists say sharks have lived in the world's oceans for millions of years. Scientists say there are more than 350 different kinds of sharks.
Sharks do not have bones, and a shark has an extremely good sense of smell. It can find. small amounts of substances in the water, such as blood, body liquids and chemicals produced by animals. Sharks also sense electrical and magnetic power linked to nerves and muscles of living animals. These powerful senses help them find their fond. Some sharks will eat just about anything. Many unusual things have been found in the stomachs of some large sharks. They include shoes, dogs, a cow's foot and metal protective clothing.
About forty percent of the different kinds of sharks lay eggs. The others give birth to live young. Some sharks carry their young inside their bodies like humans do.
Scientists are beginning to understand the importance of sharks to humans. Medical researchers want to learn more about the shark's body defense system against disease. They know that sharks recover quickly from injuries. Sharks appear never to suffer infections, cancer or heart diseases.
What is this passage mainly about？
A．The necessity of protecting sharks.
B．The living environment of sharks.
C．The dangers of sharks to human beings.
D．An introduction to sharks.
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What do scientists think of dreams Many scientists believe that dreams are ______.What do scientists think of dreams Many scientists believe that dreams are ______.
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Many scientists believe that man is ________ from apes.
A．A.descended
B．B.evolved
C．C.revolved
D．D.proceeded
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Scientists have discovered a genetic defect that a...
Scientists have discovered a genetic defect that appears to cause deficit-hyperactivity disorder, more commonly known as hyperactivity. People afflicted with this disorder have trouble focusing their attention and controlling impulses, and tend to be rest-less and aggressive. The defect occurs in a gene that regulates the body's use of the thyroid hormone. This finding was made in continuing study organized by the National Institute of Diabetes and Digestive and Kidney Diseases in which 70 percent of children inheriting the gene were hyperactive while only 20 percent of the children not inheriting the gene were hyperactive. And although the researchers admit that this defective gene probably accounts for only a fraction of cases of hyperactivity, this discovery will allow doctors to spot newborn babies likely to have the disorder, and also to provide clues for its cause and treatment.
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Scientists have discovered a close_____between smoking and several serious diseases.
A．action
B．connection
C．union
D．function
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Within ten years scientists will probably have___________.
A．the nucleus of a cell
B．cloned human beings
C．a human being in two years
D．a law to ban human cloning
E．a report on hunman cloning
F．heavy media coverage
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Scientists put forward that Northern Europe would have __________ if climate continues, while Britain would have warmer weather。
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Forty May Be the New 30 As Scientists Redefine Age Is 40 really the new 30？ In many ways people today act younger than their parents did at the same age.
Scientists have defined a new age concept and believe it could explain why populations are aging, but at the same time seem to be getting younger.
Instead of measuring aging by how long people have lived, the scientists have factored in how many more years people can probably still look forward to.
"Using that measure, the average person can get younger in the sense that he or she can have even more years to live as time goes on," said Warren Sanderson of the University of New York in Stony Brook.
He and Sergei Scherbov of the Vienna lnstitute of Demography (人口统计学) at the Austrian (奥地利的) Academy of Sciences, have used their method to estimate how the proportion of elderly people in Germany, Japan and the United States will change in the future.
The average German was 39.9 years old in 2000 and could plan to live for another 39.2 years, according to research reported in the journal Nature on Wednesday.
However, by 2050 the average German will be 51.9 years old and will be expected to live another 37.1 years. So middle age in 2050 would occur at around 52 years instead of 40 years as in 2000.
"As people have more and more years to live they have to save more and plan more and they effectively are behaving as if they were younger," said Sanderson.
Five years ago, the average American was 35.3 years old and could plan for 43.5 more years of life. By 2050, the researchers estimate it will increase to 41.7 years and 45.8 future years.
"A lot of our ski/Is, our education, our savings and the way we dear with our health care depend a great deal on how many years we have to live," said Sanderson.
This dimension of how many years people have to live has been completely ignored in the discussion of aging so far.
第36题：People 40 years of age today seem to be as young as
A．their parents were at the same age.
B．their parents were at the age of 30.
C．their children will be at the same age.
D．their children will be at the age of 30.
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Scientists have found various kinds of methods to solve the problem of global warming.
A．Y
B．N
C．NG
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Where Have All the Bees Gone？Scientists who study insects have a real mystery on their hands．A11acro...<br/>What is the mystery that researchers find hard to explain?（）
A．Honeybees are flying all across the country.
B．25-40 percent of the honeybees in the US have died.
C．Honeybees are leaving their hives and do not return.
D．Honeybee hives are in disorder．
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Scientists have known how to h______ (治理，利用) the limitless power of the sun.
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Many scientists have been probingpsychological problems（）
A．solving
B．exploring
C．settling
D．handling
