有一种落地晾衣架如图1所示，其原理是通过改变两根支撑杆夹角的度数来调整晾衣杆的高度，图2是晾衣杆的平面示意图，AB和CD分别是两根不同长度的
A couple of weeks ago，my friend offered to sell some of our things for us.I thought it was a good opportunity to__26__my 7yearold son’s room and__27__ some toys that were no longer suitabl
People who seldom take part in sports or _____ diet is high in fat will gain weight quickly. A. who B. whose C. which
在式子中，x的取值范围是______________．
下列有关机体稳态意义的叙述中，不正确的是 A．酶促反应需要稳定的环境 B．当稳态遭到破坏时，就会引起细胞新陈代谢的紊乱 C．稳态是机体进行正
Don’t be angry with us. We ______ with you together, but we were busy with our final reports when you called in. A. would eat out
在下面各句横线处依次填入的词语，最恰当的一组是 ①魅力，几乎是每个女人的梦想；然而，魅力却并不____于所有的女人。 ②我国第一部关于环境保
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