单项选择题

This passage deals primarily with ______.

A．reproductive organs of nonhuman primates
B．diseases of the pituitary glands
C．in vitro studies of pituitary hormones
D．techniques for studying hormonal reactions

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单项选择题

According to the passage, the primary benefit of the new research is that ______.

A．scientists can study the pituitary gland for the first time
B．the procedures are simpler and require fewer laboratory animals
C．the study of intact laboratory animals has now been rendered obsolete
D．researchers were able to discover prolactin

单项选择题

All of the following are true of the transplantation technique EXCEPT that ______.

A．it avoids the need for subjecting a laboratory subject to repeated major surgery
B．it permits scientists to monitor changes frequently
C．the transplanted cells grow as they would in their normal site
D．the transplanted cells can be easily grown in vitro

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