单项选择题

I believe in the theory that the more complicated animals developed from the simple ones.

A．我相信较复杂的动物是由比较简单的动物发展而来的这一理论。
B．我相信比较高级的动物是由比较低级的动物进化而来的这一学说。
C．我认为这个理论是对的，动物都是从复杂到简单转变而来。
D．我确信这个真理，动物的变化从麻烦到简化。
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单项选择题
Which of the following statements is NOT true
A．Zinc is important because it allows important chemical actions to take place in cells.
B．People only need a very small amount of zinc to maintain good health~
C．Scientists are just starting to study how zinc and other elements work.
D．A lack of zinc is rare among people in developed countries.
单项选择题
Zinc is found in most high protein foods and whole grains. Here the word whole means
A．unprocessed
B．processed
C．various kinds of
D．for the effect that
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