Children under sixteen are not permitted to participate in such kind of activities _____ bad for their mental development.

A．as is

B．as are

C．that are

D．that they are

患者女性，36岁，52kg。无呼吸困难，因甲状腺功能亢进拟行甲状腺大部切除术。

下列哪一项不能预防该反应的发生（）

A.术前使用地西泮

B.术前使用苯巴比妥

C.术前使用哌替啶

D.过度通气

E.辅助吸入氧化亚氮