某丙之父行使侵权行为之债的请求权，其诉讼时效期间自其知道侵害事实发生之Et起是多长时间？（）
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中国人民银行对各商业银行的贷款期限最长不得超过（）
阅读短文，回答 21～25 题：
第 21 题 The purpose of George Spilich's experiments is ________
A. to test whether smoking has a positive effect on the mental capacity of smokers
B. to show how smoking damages people's mental capacity
C. to prove that smoking affects people's regular performance
D. to find out whether smoking helps people's short-term memory
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