单项选择题

（） complex organic catalysts originating in living cells.

A．Enzymes are
B．Enzymes while they
C．Enzymes
D．Enzymes which are

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单项选择题
Distances in space seem （） great when compared with distances on earth.

A．hopelessly
B．excellently
C．inaccessibly
D．incredibly
单项选择题
Parents who speak（）may cause their children to become confused.

A．angrily
B．equivocally
C．aggressively
D．abnormally
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