汽车由高处向低处匀速运动的过程中,下列说法中正确的是 [ ]
A.重力势能减少,动能增加
B.重力势能增加,动能减少
C.重力势能增加,动能不变
D.重力势能减少,动能不变
答案:D
-What did you think of ______ president?-I didn’t care for him at first,but after ____ time I get to like him.
A.the; a
B./; the
C.the; the
D./; a