题干
— I only heard of John,but I never met him.What is he like?
— ______________.
— ______________.
A：He is from America.
B：He speaks English well.
C：He is kind and strong.
D：He is my best friend.
答案(点此获取答案解析）
C
；若汽车改做变速直线运动，且走同样多的路程，汽车对拖车做的功为
，则（ ）