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【单选题】
个体发育过程中最早合成和分泌的抗体是A.
IgG
B.
IgM
C.
IgE
D.
IgD
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】When mentioning 'the $4 million to $10 million range' in Paragraph 3, the author is talking about ______.
A.
gold market
B.
real estate
C.
stock exchange
D.
venture investment
【单选题】34 It is great fun
A.
looking at wives kissing their husbands.
B.
listening to students talking to their teachers.
C.
betting on the winners of each game.
D.
watching farmers kicking their donkeys.
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