问题 单项选择题

黄芪桂枝五物汤中没有的药物是()

A.芍药

B.桂枝

C.生姜

D.甘草

E.大枣

答案

参考答案:D

问答题

阅读下文,完成以下各题

奇特的海水咸度


①海洋,奔腾不息。海水,深邃莫测。但口渴者却不敢问津,因为它有着又成又涩的苦味。
②现在科学家已经测出,海水有3%左右是食盐。可别小看这区区的3%,如果把它全部提炼出来,平铺在陆地上,陆地的高度将要增加120多米,这是多么巨大的数量啊!
③除了食盐外,海洋中还含有100万亿吨镁,600万亿吨钾,88万亿吨铜,58亿吨镍,40亿吨铀,这样看来,海洋又是矿物的大仓库。
④其实,海水并不是一开始就充满盐分,它最初和江河湖水一样,也是含盐量很少的淡水。但地球的水总是在不停地运动,不停地循环。有人曾做过这样一项测试:单单每年从海湾表面蒸发掉的水分,就达到1亿吨。这么多的水又会变成雨,降到陆地的每个角落。它们潺潺而流,不断地冲刷岩石,冲刷土壤,把岩石和土壤中的可溶性物质带进江河之中,而这些物质,绝大部分都是各种盐类。盐分随着水流进入江河,而江河之水最后又都回归大海。蒸发掉的水分再次回到自己的海洋老家,但它却带来了很多陆地上的盐分。
⑤就这样,海洋源源不断地从陆地上得到微量物质,成了所有溶解盐类的收容所。可是在海水的蒸发过程中,进入海洋的盐分却不能随水蒸气升空,只得滞留在大海洋之中。
⑥如此周而复始,日积月累,海洋中的盐类物质越积越多,海水也就理所当然地变得越来越咸了。当然,这是一个极为缓慢的过程,可是经过几百万年甚至更久的年代,积累起来的盐分也就十分可观了。
⑦海水中既然已经含有那么多盐分,而且以后每年还要从陆地上带回大约30亿吨的可溶性物质,海水会不会永无止境地越变越成会不会把所有的海洋生物都咸死
⑧这种担心完全是合情合理的。如果海洋没有减少自身盐分的方法,结果肯定会这样。但科学家在研究中发现,海洋有各种能降低海水含盐度的奇妙方法。
⑨随着陆地可溶性物质不断进入海洋,当达到一定的浓度后,便会互相结合成不溶解性化合物,沉入到海洋的底部。这个过程就像明矾能沉积水的杂质那样,使浑浊的水质变清。除此以外,许多物质还会被海洋生物的细胞所吸收,等生物体死去后,便随尸体沉入到海底。以上这些途径,都能大大降低海水中的含盐浓度。
⑩当台风季节降临时,狂风巨浪常把海水卷到陆地上,溶解的盐分也随海水上岸,散布在沿海陆地。尤其在漫长的历史变迁年代中,有些海洋的海湾地带,由于地壳的升高而与海洋隔断。于是,这部分的海水逐渐被蒸发掉,留下大量的溶解性盐类物质,这也是盐分回归陆地的一种方式。例如,现在陆地上某些开采食盐的盐矿,就是这类干涸掉的小块海洋的残迹。

海洋有哪些能降低海水含盐度的方法请用简练的语言加以概括。

完形填空

完形填空(2) 阅读下面短文,掌握其大意,然后从11~20各题所给的A、B、C和D项中,选出最佳选项,并在答题卷上将该项涂黑。

The theory of evolution was made by Charles Darwin. It has had a great      11       on the world today. It has caused many debates between religious authorities and those from the   12      community. This theory makes people think about their origins. It has changed the way in which they think about themselves in the environment. Charles Darwin collected and provided a lot of information to   13         his theory. His theory and research made him the most popular one in the scientific field of    14         .

Charles Darwin was born in 1809. He was the fourth child in his family. Much of Darwin’s childhood was spent   15     insects and reading books about        16       history. Charles Darwin was not a   17        student during his years at the medical college. He disliked what he was taught. But he   18       an interest in studying rocks and fossils.

Later, he had a chance to travel as a naturalist. It was this chance that made him begin his work on evolution. After a few years’ hard study, he wrote a book called The      19       of Species. In this book, Darwin explained his  20       about “natural selection” and “struggle for existence” .

11. A. effort                  B. effect                C. affect                      D. affection

12. A. scientific             B. social                C. abstract                   D. material

13. A. imagine              B. picture              C. prove                      D. discuss

14. A. heredity              B. physics              C. chemistry         D. evolution

15. A. raising         B. collecting          C. planting                   D. watching

16. A. natural         B. human              C. literature          D. universal

17. A. naughty              B. popular             C. incommunicative      D. good-tempered

18. A. found          B. realized             C. developed         D. announced

19. A. Origin         B. Beginning  C. End                        D. Result 

20. A. ways                  B. ideas                 C. opinions                  D. theory