Have you ever thrown away a bottle of water? Maybe a bottle of water does not seem like much to you, but it can save the day for people who live in drought-hit* areas in China. In the past few mont
—Let's play basketball after school． —____________________． A．Yes, please B．No, I don't C．That sounds great
_____ some teenagers don’t realize is _______ difficult life can be after they get addicted to drugs. A. What?what a B. What? how C. That?how D. That?
下列说法正确的是( )A.物质发生化学反应都伴随着能量变化B.伴有能量变化的物质变化都是化学变化C.在一个确定的化学反应关系中，反应物的总能
已知向量、满足，，且，则向量和的夹角为（ ） A.30° B.45° C.60° D.90°
下列这则生日祝福语的手机短信，句中存在语病，请找出并加以修改。 今天，你因霓虹而失神，你只为月光而明亮，让星光为你点上蜡烛，让繁星替我
_ Lily _ Lucy is going with you because one of them must slay at home.A．Not only；but alsoB．Neither; nor C．Both;and D．Either;or
如图13-4-4所示，在真空中把一绝缘导体AB向带负电的小球P缓慢地靠近(不相接触)时，下列说法中正确的是 A.B端的感应电荷越来越多B.导体内部场强越来越
,则
=____________.
