19. A. fighting B. struggling
C. battling
D. competing
【解析】选B。逻辑推理题。该句意思是: 她们在拼命挣扎, 没有时间呼喊救命, 故正确答案为B项。
20. A. puzzled B. gone
C. looked
D. thought
【解析】选A。词义辨析题。根据上文这条狗感到了她们处于危险之中, 可推断下文意思: 这条狗竟然感觉到有人遇险, 而玛丽到现在还在“纳闷”这条狗是如何知道的。puzzle over“对……迷惑不解”; go over“复习”; look over“查看”; think over“仔细考虑”。
A,B,C或D四个选项中,选出最佳选项。
Sometimes, the simplest ideas are the best. For example, to absorb heat from the sun to heat water, you need large, flat, black surfaces. One way to do that is to build those surfaces specially, on the roofs of buildings. But why go to all that trouble when cities are full of black surfaces already, in the form of asphalt(柏油) roads?
Ten years ago, this thought came into the mind of Arian de Bondt, a Dutch engineer. He finally persuaded his boss to follow it up. The result is that their building is now heated in winter and cooled in summer by a system that relies on the surface of the road outside.
The heat-collector is a system of connected water pipes. Most of them run from one side of the street to the other, just under the asphalt road. Some, however, dive deep into the ground.
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