问题
选择题
The two balls fell ________the same speed and landed ________the ground at the same time.
A．off;on
B．by;in
C．with;on
D．at;on
答案
D
at the same speed以同样的速度；on the ground在地面上。
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The two balls fell ________the same speed and landed ________the ground at the same time.
A．off;on
B．by;in
C．with;on
D．at;on
D
at the same speed以同样的速度；on the ground在地面上。