My suggestion yesterday was that a meeting______to discuss the matter.
A. should
B. must be held
C. would be held
D. be held
一般的酶促反应速度较快的温度是( )
A. 温度100℃时
B. 温度0℃以下时
C. 温度60℃
D. 温度30~40℃时
E. 温度0~100C时
There was so much noise that the speaker couldn't make herself ______.
A. heard
B. to hear
C. hearing
D. being heard
分泌HC1的是( )
A. 壁细胞
B. 主细胞
C. 黏液细胞
D. 幽门黏膜中G细胞
E. 胃黏膜表面上皮细胞