A:部分铁塔的倒塌影响了输电系统的整体功能;
B:该输电系统的相关性是造成这种损失的原因之一;
C:该输电系统的目的性不明确;
D:该输电系统的环境适应性不好。
下列化石可以证明鸟类可能起源于古代爬行类的是( )
下列对南京解放的意义的总结,正确的是( )
白化病是人类的一种遗传病,它是由于细胞内缺乏促使黑色素形成的酶造成的。针对白化病,下列叙述正确的是
如图是人血涂片示意图,对该图的叙述中错误的是( )
选择合适的句子,补全对话。(有两项是多余的)
A. What did you do yesterday?
B. Where did you go yesterday?
C. How many children were there at the party?
D. Yes, he did.
E. Why did you visit Mike?
F. No, they weren't.
G. How many children are there at the party?
A:Hello, Liu Yun. ____
B:I visited Mike.
A:____
B:Because it was his birthday yesterday.
A:Did he have a birthday party?
B:____
B:There were fifteen children at the party.
A:Were Mike's parents at home?