单项选择题

A．The largest sea creatures ever known.
B．Fish living in shallow waters.
C．Plant-eating land animals.
D．Meat-eating land animals.
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单项选择题
A．About 45 million.B．About 5.4 million.C．About 50 million.D．About 4.5 million.
A．About 45 million.
B．About 5.4 million.
C．About 50 million.
D．About 4.5 million.
单项选择题
ADH is a cover term for a large and diverse group of enzymes.
A．Y
B．N
C．NG
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