单项选择题


Questions 14-16 are based on the following passage. You now have 15 seconds to read Questions 14-16.
Why did the professor put the food in a small box

A．To give the monkey a surprise.
B．To see how the monkey ate from a box.
C．To see how soon the monkey could find it.
D．To find out how the monkey would open the box.
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单项选择题
We can infer from the first two paragraphs that the industrialists disregard environmental protection chiefly because ______.
A．they are unaware of the consequences of what they are doing
B．they are reluctant to sacrifice their own economic interests
C．time has not yet come for them to put due emphasis on it
D．it is difficult for them to take effective measures
单项选择题
Why is the Space Shuttle Columbia special
A．Because it is not similar to the spaceships of the previous twenty years.
B．Because it has different designs and is able to return to earth and make further flights.
C．Because it can be used in a variety of ways now.
D．Because it can be used to establish colonies on earth.
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