单项选择题

How many people are involved with the production of rubber in Malaysia

A．13 million.
B．7 million.
C．3 million.
D．30 million.
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单项选择题
In Bendigo’s time, the length of a fight was ______.
A．5 rounds
B．10 rounds
C．50 rounds
D．unlimited
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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