英语六级

单选题

A．To show that enzymes are very effective.
B．To point out that enzymes can sometimes fail to work.
C．To explain what enzymes are made of.
D．To describe different types of enzymes.

参考答案：A进入在线模考
 Why does the professor talk about locks and keys?
细节题。根据Enzymes act like your hands，quickly allowing chemical reactions that would otherwise take much longer．Now，there are two reasons that enzymes are so effective at enabling biochemical reactions．可知，教授提及锁和钥匙主要是为了表明酶很有效。因此。正确答案为A。

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1

A．The relationship between painting and sculpture.
B．The ideas behind an art ist' s work.
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A．It is often displayed outdoors.
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A．To give an example of natural shapes.
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