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听力:What does Ben Carson mother tell him to do when he was a school boy? Q: What does Ben Carson mother tell him to do when he was a school boy? A.Write two book reports a week. B.Keep a diary. C.Help with housework. D.Watch education.
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举一反三
【简答题】Mary told me not to worry because the (operate) ______on Mr.Smith was very successful.
【单选题】—Tom, may I borrow your book Chicken Soup? —Sorry, I ____ it to Mary. [     ]
A.
lent
B.
have lent
C.
had lent
D.
lend
【单选题】.—____ —Sorry, I don’t know.
A.
Have you seen Mr.Smith?
B.
Where has Mr.Smith gone?
C.
How about Mr.Smith?
D.
Hello, Mr.Smith.
【简答题】A.Because books could be lent to everyone. B.Because books could be lent at no costs. C.Because books were lent to students and faculty. D.Because books were lent on a paid membership basis.
【单选题】100个初级精母细胞经过减数分裂以后可以形成——个精子
A.
100
B.
200
C.
300
D.
400
E.
500
【简答题】, lent, lent
【单选题】He ___ some books ___ me, and never gave them back. [     ]
A.
lent, to
B.
lent, from
C.
borrowed, to
D.
borrowed, from
【单选题】以下哪项不属于机械零件常见的失效形式( )
A.
断裂
B.
过量变形
C.
表面失效
D.
弹性滑动
【简答题】100个初级精母细胞经过减数分裂后可形成( )个精子;100个初级卵母细胞经过减数分裂可形成( )卵细胞。(以动物为例)
【单选题】100个初级精母细胞经过减数分裂以后可以形成精子数目是
A.
50
B.
100
C.
200
D.
300
E.
400
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