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【单选题】
有关实验动物个体因素对化学毒物毒性影响的概念中,不正确的是( )A.
一般幼年和老年动物易受毒物伤害
B.
幼年和老年动物对需代谢活化的化学毒物不如成人敏感
C.
胚胎期比出生后对毒物敏感
D.
一般成年动物中，雌性动物比雄性动物敏感，但也有例外
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【单选题】She said the contest ________ by the Students’ Union the next Friday.
A.
will be held
B.
would be holding
C.
would be held
D.
was holding
【单选题】— See you next Friday. — Next Friday? Why, what _____ that day? [ ]
A.
will be happened
B.
happened
C.
is happening
D.
has happened
【单选题】--Next Friday will be my birhday! --________________________
A.
Sorry to hear that.
B.
Let's have a party!
C.
Long time no see.
D.
Happy new year!
【单选题】We are leaving tomorrow. We will be away next Friday.
A.
from
B.
until
C.
on
D.
since
【简答题】CTC系统具有两种控制模式:( )和( )。
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