__________ he needs help, he will go to Mr. Smith.
A. Whenever
B. Whatever
C. Whoever
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She had no _________ but to ask for a few day’s leave.
A. alternative
B. choose
C. select
Fortunately, the storm only did _______ damage to the farmer’s crops.
A. minimal
B. maximum
C. major
举例说明体内负反馈和正反馈的调节过程及其生理意义。