激活糜蛋白酶原的是（）
A.肠致活酶
B.胰蛋白酶
C.盐酸
D.组胺
E.辅酯酶
参考答案：B
-I didn't do well in the last English contest. How about you.
-_________. [ ]
A. I'll do better next time
B. Even worse
C. A lot better
D. I like English, though
天线电路是手机接收电路的第一级电路，也是发射电路的第一级电路。（）
