英语六级

单选题

A．Provide extra energy to start the reaction.
B．Raise the temperature of the chemicals.
C．Release a chemical needed to start the reaction.
D．Lower the amount of energy needed to start the reaction.

参考答案：D进入在线模考
 What do enzymes do to help start a biochemical reaction?
细节题。根据Now，there are two reasons that enzymes are so effective at enabling biochemical reactions．First enzymes greatly reduce the amount of energy required to start the reactions可知，酶通过较少能量帮助开启生化反应。因此，正确答案为D。

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1

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.

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2

A．The relationship between painting and sculpture.
B．The ideas behind an art ist' s work.
C．The practical value of a work of art.
D．The way the eye perceives shape in sculpture.

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3

A．It is often displayed outdoors.
B．It does not always represent an object.
C．It is three-dimensional.
D．It is done by relatively few artists.

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