A. unusual
B. simple
C. weak
D. slow
【答案解析】
本文介绍了法国对太空宇航员长期在太空飞行,会使骨里的密度减少而对骨不利的研究。
1. D。细节题。根据文章第4段的定语从句who had spent one to six months in space可推知此题答案为D。
2. B。细节题。根据文章第5段第1句The BMD loss was significant in the tibia(胫骨) of the lower leg, a weight-bearing bone可推知此题答案为B。
3. D。细节题。根据文章第6段Without gravity…所引起的结果,可推知此题答案为D。
4. A。词义猜测题。上文提到对十五人进行研究表明在整个航行过程中骨损在继续,下文再说especially striking,可知是“特别明显”的事,因此选A。
(9)
Some spiders hunt on the ground, others build webs to trap their food, but the grass water spider catches its prey by running along the surface of the water.
This special water spider lives on the grassy banks of streams where mosquitoes, damsel flies and other insects come to feed and breed.
Although it is one of the largest spiders in New Zealand, it has an unusual ability. It doesn’t disturb the water as it waits for its meal, and there is barely a ripple(波纹) when it skims(掠过) across the surface at lightning speed to catch its prey.
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