下列均是大气污染对健康的直接危害，除了
A．慢性中毒B．变态反应C．急性中毒D．佝偻病E．肺癌
参考答案：D
词汇与短语。
1. Vienna is the c___ of European classical music.
2. Mozart was born in A __ in 1956.
3. Miss Wang plays the g ___ very well.
4. My e ___ brother is two years older than I.
5. Mozart w___ his first opera at the age of fourteen.
国际出入口信道提供单位在接到互联单位的申请后，应当在（）个工作日内为互联单位开通所需的国际出入口信道。
A、5
B、20
C、30
D、100
