根据首字母提示写出单词

1. Any helpful s_______ would be welcome.

2. Are you all c_______ now about what you have to do?

3. The r______ of the game are quite simple.

4. She is a tour guide, so she always 1_______ the way while visiting the Science Museum.

5. It's one o'clock now. You must be s_______! Could I get you something to eat?

法洛四联症缺氧发作的主要原因为()

A．心衰、肺水肿

B．脑血栓

C．回心血量过多

D．肺动脉漏斗部狭窄

E．血粘度增加，血流缓慢