The most important purpose of a lecture is to ______. A. speak B. talk C. tell
_______ or not, you’ve got to accept that your kids are grown up now. A. Whether you like it B. If you like it C. Whether you like them
在20世纪70年代初的伦敦,一位来自纽约的旅客说:“这里的银行、旅馆、商店都一样,他们看到我们手里的美元时,流露出的神情,好象这些美元成了病
甲型H1N1流感病毒属于混合型重组流感病毒,此病毒发生重组的是 。
单项选择 A/An_________ can use his drawings to tell about beautiful mountains, the blue sea and many other things. A.actor B. scientist C. artist D. doctor
你还知道那些其他濒临灭绝的物种吗?What other ____________________________ do you know?
既有离子键又有配位键的化合物是 ( ) A.NH4NO3 B.NaOH C.H2SO4 D.H2O
“a、b为异面直线”是指:①,且a不平行于b;②,,且;③,,且;④,;⑤不存在平面能使,. 成立. 其中正确的序号是( ) A.①④⑤