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【单选题】
完全叶包括A.
叶片，叶柄，托叶
B.
叶片，叶柄
C.
叶片，托叶
D.
叶柄，托叶
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following is NOT true of working class Americans?
A.
They work long hours.
B.
They live from paycheck to paycheck.
C.
They want to save money for presents.
D.
They don't want to be healthy eaters
【单选题】Which of the following is cited as an expression of American pessimism?
A.
America is no longer a mighty and good-hearted giant.
B.
Bill O'Reilly and his like are popular among the public.
C.
Americans consider their houses as pots of lead.
D.
Most Americans think the Iraq war was not worth the fighting.
【单选题】Which of the following is Not true of working class Americans?
A.
They work long hours．
B.
They live from paycheck to paycheck．
C.
They don’t want to be healthy eaters．
D.
They want to save money for their children．
【单选题】Which of the following is Dr. Bruce McEwen inclined to emphasize by saying 'But in the long run these hormones can have a harmful effect on the body and brain'?
A.
a person's memory is determined by the level of hormones in his body.
B.
stress hormones have lasting positive effects on the brain.
C.
short bursts of stress hormones enhance memory function.
D.
a person's memory improves with continued experience of stress.
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