—Could you help me _____my English, Jack? —No problem.
A:with
B:in
C:at
如图,要利用一面墙(墙长为25米)建羊圈,用100米的围栏围成总面积为400平方米的三个大小相同的矩形羊圈,求羊圈的边长AB,BC各为多少米?
— Don't ________. Listen to what the teacher is saying carefully.
— Yes, I see.
关于重力加速度,下面说法正确的是( )