Studies show that Americans chat on their phones for more than five hours a month, _____ Europeans.

A．as much as twice

B．twice as much as

C．as much twice as

D．as twice much as

男，20岁。右胸撞伤后疼痛，R20/ min，P85/min，胸廓挤压征阳性，胸片右肺压缩5‰最恰当的处理是

A．胸膜腔穿刺抽气

B．胸腔闭式引流

C．镇痛观察

D．输液

E．吸氧