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【单选题】
带虫免疫是宿主感染寄生虫后产生的免疫力( )A.
能将寄生虫清除
B.
不能清除寄生虫
C.
虽不能将虫体全部清除,但对重复感染产生一定的免疫力
D.
可使虫体寿命缩短或症状减轻
E.
虽不能将虫体全部清除,但对重复感染产生一定的免疫力,这种免疫力当宿主至被治疗后就逐渐消失
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【单选题】— Look, that's Tom-the lost boy! — It's really great comfort to see him safe again. He is sure to bring comfort to his worried mother. [ ]
A.
a; a
B.
the; the
C.
a; /
D.
the; /
【单选题】听力原文：Interviewer: Well, today on Starting Out, we look at the sandwich industry in Britain. I have with me Brian Fraser, the owner of 'Designer Sandwiches', and Geraldine Holmes, another successful sa...
A.
His first shop was unpopular.
B.
He had to close one of the shops.
C.
His second shop didn't open on time.
【简答题】说明信号和变量的功能特点,以及应用上的异同点。
【简答题】能量信号的特点________
【简答题】信号按信号的能量特点进行分类：
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