题干
I usually get up ______ six ______ the morning.
A：at; in
B：on; at
C：to; with
D：at; on
答案(点此获取答案解析）
A
I usually get up ______ six ______ the morning.
A：at; in
B：on; at
C：to; with
D：at; on
、
、
、
。一电子由M点分别运动到N点和P点的过程中，电场力所做的负功相等，则（ ）