单项选择题

To succeed in a scientific research project, ______.

A．one needs to be persistent
B．persistence is needed
C．one needs be a persistent person
D．persistence is what one needs

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单项选择题

A．man possesses far more senses than the five major ones
B．man possesses a few more senses than animals
C．man possesses as many senses as animals
D．man has fully utilized his senses

单项选择题

The phrase sensitive skins (Line 6, Para.2) most probably means（）

A．skins that are quick to feel and respond
B．skins that are delicate
C．skins that are completely dry
D．skins that are sticky or slippery