根据《民法通则》，下列关于民事法律行为的表述，不正确的是( )。
A. 无效的民事行为，从行为开始时就没有法律约束力
B. 被撤销的民事行为，从行为开始起无效
C. 民事行为部分无效，不影响其他部分效力的，其他部分仍然有效
D. 显失公平的民事行为无效
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The shark's best sense is smell because ______.
A. most of its brain is used for this purpose
B. it is colour blind
C. it can smell blood from a quarter of a mile away
D. it can only see up to fifty feet
Who was the man at the door
A. Someone from work.
B. A friend who needed advice.
C. A complete stranger.
D. A neighbors she hardly knew.
It is less common to find sharks in ______.
A. salt water
B. fresh water
C. warm water
D. deep water
According to the author, knowing the cause of the misery will help ______.
A. shorten the duration of the illness
B. the patient buy medicine over the counter
C. the patient obtain cheaper prescription drugs
D. prevent people from catching colds and the flu
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