有机磷农药中毒属于（）
A.不可逆抑制
B.竞争性抑制
C.非竞争性可逆抑制
D.可逆性抑制
E.反竞争性可逆抑制
参考答案：A
政府债券的风险主要是( )。
A．购买力风险 B．信用风险 C．经营风险 D．财务风险
_____ sleep every night is important for teenagers. _____, loss of sleep can make you feel tired, and even
cause you to put on weight. [ ]
A. A good amount of; As a matter of fact
B. A good number of; In truth
C. A large amount of; As matter of fact
D. Plenty of; In a fact
