- 工业制取三氧化硫
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With what topic is the passage mainly concerned
A．Breeding habits of whales.
B．Differences between whales.
C．Efforts to preserve whales.
D．The intelligence of whales.
正确答案
B
解析
本题为主题题。文章首句即向我们介绍了鲸分为两大类，接着运用了举数字、比较与对比的方法分别介绍了两类鲸的情况。文章的脉络很清楚，就是向我们介绍两类鲸，因此选B。
Which of the following is mentioned by the author as a reason why the baleen whale population has been reduced
A．Increased pollution of the seas.
B．Hunting.
C．Insufficient supply of food.
D．Disease.
正确答案
B
解析
文章第二段中“Though reduced by hunting…”一句告诉我们此种鲸变少的原因在于捕杀，因此选B。
The author would most probably agree with which of the following statements about Thomas Jefferson
A．He had a broad vision of his country's future.
B．He put the interests of Virginia ahead of those of the Union.
C．He ignored the advice of people who settled the western region.
D．He was one of the first government officials to travel in the western United States.
正确答案
A
解析
本题为细节题。首先文中提到的1784年法中重要原则“underlay the whole later development of the continental United States”，后面又提到Thomas Jefferson在《独立宣言》发表前就有此主张。因此选项A应符合作者的想法，应选A。
心脏破裂的典型表现为
正确答案
解析
心脏破裂，不会跳，也不能再完成心动周期。但是心肌电生理现象仍然存在。
大肠癌最好发的部位是
正确答案
解析
大肠癌的发病率从高到低依次为直肠、乙状结肠、盲肠、升结肠、降结肠及横结肠。
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