下面不需设两个安全出口的有（）。A．面积为90m2，甲类厂房，生产人数为4人 B．面

看图填词。

     John is an American student. He is studying Chinese in China. He can speak a  1_______ Chinese now.

One day when he was lying (躺) on the 2_______ and 3_______ to the radio. He had a good 4_______.

Suddenly (突然) he heard someone was calling for 5_______. He jumped up quickly, looked out towards (朝)

the sea and 6_______  a boy waving (挥动) his 7_______  on the water. He took off (脱下) his 8_______  and

jumped into the 9_______ . He swam (swim的过去式) to the boy. Soon he carried the 10_______ back to the

beach. He saved (救了) the boy.

OSI参考模型可以分为7层。数据的压缩、解压缩、加密和解密工作都由 (52) 负责，电子邮件和网络管理程序工作在 (53) 。

A．应用层

B．网络层

C．传输层

D．表示层

等渗性缺水多发生在

A．胃肠液急性丧失
B．大量出汗
C．吞咽困难
D．慢性肠梗阻

大众传播通过营造（）来影响和制约舆论。

A.拟态环境

B.意见环境

C.意见气候

D.多数意见

支付赔偿金、返还财产和恢复原状的赔偿方式应当单独适用．( )