There are approximately 500 （） now in operation in the United States.

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• There are many cities（）very fast.

  A . expanding B . expands C . expanded D . expand

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• The approximate positions of the stars are based on sidereal time，which is based upon rotation of the Earth relative to（）.

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• For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system?（）

  A . 0.4 nanometers B . 0.6 nanometers C . 0.8 nanometers D . 1.2 nanometers E . 1.6 nanometer

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• How many（）are there altogether?

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  A . less B . more C . little D . lotsof

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  A . in chief engineer's room B . in chief officer's room C . on the bridge D . on deck

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• If all other conditions such as bore, stroke, speed, and mean effective pressures are equal, a two-stroke/cycle diesel engine will develop approximately（）

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• A customer needs approximately 24 TB of RAW storage for some media files. SATA or nearline SAS drives are the obvious choice but rack space and budget are dominating factors. Which of thefollowing choices would be the best solution for this customer?（）

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• There are（）rats on board.

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• For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？ （）

  A .  0.4 nanometers B .  0.6 nanometers C .  0.8 nanometers D .  1.2 nanometers E .  1.6 nanometer

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• The fact that in Inuit culture there are 50 different words describing snow is an example of our differences in perception based on our experiences.

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  A．where B．wherever C．that D．that wherever

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• In 1971 there were about 3,700 million people in the world. If the population were 【C1】______ evenly over the earth' s surface there would be about 50 people to the square mile; but there are vast areas of desert and mountain and tropical forest 【C2】______ are uninhabited, 【C3】______ at the other 【C4】______ , in the great cities millions may live within a few square miles.

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