单项选择题

Medical students are advised that the wearing of a white coat （）the acceptance of a professional code of conduct expected of the medical profession.

A．supplements
B．simulates
C．signifies
D．swears

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单项选择题

My grandfather, a retired worker, often （）the past with a feeling of. longing and respect.

A．considers
B．contemplates
C．contrives
D．contacts

单项选择题

By cloning Missy, Mark Westhusin hopes to （）

A．study the possibility of cloning humans
B．search for ways to modify its temperament
C．examine the reproductive system of the dog species
D．find out the differences between Missy and its clones