单项选择题

A．He doesn’t believe it will be extremely hot tomorrow.
B．He doesn’t like hot and humid weather.
C．He just bought an air conditioner.
D．He has to get the woman’s air conditioner to work.
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单项选择题
A．How animals survive harsh conditions in the wild. B．How animals alter colors to match the surroundings. C．How animals protect themselves against predators. D．How animals learn to disguise themselves effectively.
A．How animals survive harsh conditions in the wild.
B．How animals alter colors to match the surroundings.
C．How animals protect themselves against predators.
D．How animals learn to disguise themselves effectively.
填空题
Today, air travel is far safer than driving a car on a busy (26) . However, there is a danger that grows every year. From the moment an airplane (27) to the moment it lands, every movement is watched on radar screens. Air traffic controllers tell the pilot (28) when to turn, when to climb and when to come down. The air traffic controllers around a busy airport may (29) 1000 planes a day. Any plane that flies near the airport comes under the (30) of the controllers there. Even a small mistake on their part could cause a disaster. Recently, such a disaster almost happened. Two large jets were flying towards the airport. One was carrying 69 (31) from Chicago. An air traffic controller (32) on his radar screen that the two planes were too close to each other. He ordered one to turn to the right and to climb, but he made a mistake: He ordered the wrong plane to do this. So, (33) turning away from the second plane, the first plane flew towards it. Fifteen seconds later, it flew directly in front of the second plane. They (34) each other by a second. The distance between them (35) that of a large swimming pool. This is an example of the dangers that grow every year.
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