Mike works very long hours every day. He usually gets up at 17:00. He has a shower and makes his breakfast. What a funny time to make breakfast! After breakfast he practices his guitar, then he puts on his jacket and goes to work. To get to work, he takes the number17 bus to the Star Hotel. The bus usually leaves at 19:15. He works all night. People love to listen to him! He gets home at 7:00, and he watches the early morning news on TV. He goes to bed at 8:30, a tired but happy man. Can you think what his job is?

A、活性炭  B、酒精  C、熟石灰   D、聚乙烯塑料

E、钛合金  F、石墨  G、小苏打   H、一氧化碳

如图，矩形ABCD的对角线AC和BD相交于点O，过点O的直线分别交AD和BC于点E、F，AB=2，BC=3，则图中阴影部分的面积为（　　）

我们要提高网络交往的警惕性，是因为网络交往神秘莫测，其交往对象是（    ）