胃蛋白酶最适宜pH1.5～2.5，主要分解蛋白质肽键。( )
参考答案：错
I was close to being killed the other day. A car passed me at I thought was a dangerous speed. [ ]
A. as
B. what
C. which
D. that
把8支红铅笔和2支蓝笔放在一个包里，让你每次往里摸一次，这样摸了20次，摸出蓝铅笔大约占总次数的______．
