世界上最大的航空母舰是美国的（）航空母舰。
A.小鹰级
B.企业级
C.大鲨鱼级
D.尼米兹级
参考答案：D
Many students have never been to China before and _____ any Chinese. [ ]
A. could hardly say
B. can hardly talk
C. can hard speak
D. can hardly speak
抢救经呼吸道吸人的急性中毒，首要采取的措施是
A．清除尚未吸收的毒物
B．排出已吸收的毒物
C．使用解毒剂
D．对症治疗
E．立即脱离现场及急救
