用所给单词的适当形式填空。

1. I am _____ (throw) the ball to Danny.

2. Everyone in the gym is _____ (loud).

3. Are you ready to _____ (learn) ping-pong?

4. Badminton, ping-pong, soccer and basketball _____ (be) sports.

5. Bob is a basketball _____ (play).

下列有关红细胞渗透脆性试验条件，哪项是不正确的()

A．pH7.0PBS

B．37℃

C．24小时

D．540nm测定

E．绘制曲线