风湿性心脏病最易侵犯的瓣膜是：

A．主动脉瘤

B． 肺动脉瘤

C．二尖瓣

D．三尖瓣

E．二尖瓣＋主动脉瘤

根据所给汉语完成英语句子。

1.It _______ (看起来像)snow, doesn't it?

2.Do you think the rain will stop _______ (到中午之前)?

3.It always rains ________ (在周末),doesn't it?

4.Today's weather is _______ (有点热)for me.

5.Sandy Beach is ______ (从不拥挤).

6.The two boys are _______ (浏览) the new books in the bookstore now.

7.Mrs Hill is _______ (排队等待) to buy some eggs.

8.The old man is waiting _______(过马路)

9.Their prices are really high, _____(不是吗)?

10.This line is slow, ______(不是吗)?