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【单选题】

We don't know why _____ many students made _____ careless mistakes.
[ ]

A.
so; so
B.
so; such
C.
such; so
D.
such; such
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【简答题】(本小题满分12分)若盒中装有同一型号的灯泡共12只，其中有9只合格品，3只次品.(1)某工人师傅有放回地连续从该盒中取灯泡3次，每次取一只灯泡，求2次取到次品的概率；(2)某工人师傅用该盒中的灯泡去更换会议室的一只已坏灯泡，每次从中取一灯泡，若是正品则用它更换已坏灯泡，若是次品则将其报废(不再放回原盒中)，求成功更换会议室的已坏灯泡前取出的次品灯泡只数X的分布列和数学期望.
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【单选题】My sister is ill. I have to _______her at home.[ ]
A.
look at
B.
look up
C.
look after
D.
look for
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【单选题】It's six o'clock in the morning. It's time to ____.[ ]
A.
do homework
B.
get up
C.
have lunch
D.
go home
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【单选题】He cut off half his right arm______ a knife ______the dangerous situation.
A.
with , under
B.
with, in
C.
in, in
D.
in, under
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【简答题】用方框中所给词的适当形式填空allow, worry, be, listen, light1. Sheisquite_______aboutherson'shealth. 2. IfI______you,Iwouldn'ttellhimthetruth. 3. Ithinkweshould______towearourownclothes. 4. Iamagainst______fireinthe...
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【单选题】Doing sports can help improve our health
A.
make …worse
B.
make …better
C.
make…the same
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【单选题】Mary often _______ her friends ______ her life in China.
A.
tells, to
B.
tells , about
C.
asks , for
D.
helps , to
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【单选题】When he arrived at the office, he found all the workers ______. [ ]
A.
working
B.
work
C.
to work
D.
worked
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【单选题】—Do you know the girl ____ red?—Oh, she is my sister.
A.
/
B.
in
C.
at
D.
with
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【单选题】Bill can play_____violin but he can’t play _____chess.
A.
the, /
B.
the, the
C.
/, the
D.
a, /
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