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【单选题】
.如图所示，质量为0.1kg的木块，在一个水平面上和一个倔强系数为20N∙m-1的轻弹簧碰撞，木块将弹簧由静止位置压缩0.4m. 假设木块与水平面间的摩擦系数为0.25. 问在开始碰撞时木块的速率为多少？ （ ）【图片】A.
4.65 m/s
B.
5.62 m/s
C.
6.47 m/s
D.
5.83 m/s
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【单选题】Boys and girls, wish you to do well in the English exam ____ a light heart. Good luck to everyone!
A.
on
B.
with
C.
without
【单选题】Why can't you see light when you look at a black hole?
A.
Because most black holes are so far away.
B.
Because the gravity of a black hole is so strong that it sucks? the light inward.
C.
Because as the star's gases burn, it stops giving off heat and light.
D.
Because as a star cools, its outer layers pull in toward its center.
【单选题】—Look，the light in Jim’s room is still on. Do you know______? —To study for the coming exam, maybe.
A.
if he works hard
B.
why is he so busy
C.
why he stays up so late
D.
when he will stop working
【单选题】Boys and girls, wish you to do well in the English exam _____ a light heart. Good luck to everyone! [ ]
A.
on
B.
with
C.
without
D.
in
【单选题】You look that light-hearted. Nothing seems ________ to you.
A.
to happen
B.
to be happened
C.
to have happened
D.
to have been happened
【单选题】在句子“A light heart lives long.”中,主语部分是:
A.
heart
B.
A light heart
C.
light heart
D.
lives
【简答题】You look
light-hearted. Nothing seems _____ to you.A. to happen B. to have been happened C. to have
happened D. to be happened
【单选题】You look like light-hearted. Nothing seems ____ to you. [ ]
A.
to happen
B.
to be happened
C.
to have happened
D.
to have been happened
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