不是竞争性抑制剂的化合物是（）
A.5－氟尿嘧啶
B.甲氨蝶呤
C.6－巯基嘌呤
D.磺胺类化合物
E.嘌呤霉素
参考答案：E
After finishing middle school, my sister did nothing ____ at home.
A．but read
B．but to read
C．besides reading
D．except to read
芳香族聚酰胺纺制弹力丝
