My family seven members.[ ]
A. have
B. has
答案:B
–What will the weather be like tomorrow?
–It____ be rainy, cloudy or sunny. Who knows?
A.must
B.might
C.shall
D.should
如图所示,AB为斜面,BC水平面。从A点以水平初速度v向右抛出一小球,其第一落点与A的水平距离为s1;从A点以水平初速度2v向右抛出一小球,其第一落点与A的水平距离为s2。不计空气阻力,则s1:s2可能为
A.1:2
B.1:3
C.1:4
D.1:5