发展（）是发展第三产业的首要任务。
A.交通运输业
B.教育业
C.农业
D.邮电通讯业
参考答案：D
The meeting began two hours ago and because no decision _______, we will continue our discussion tomorrow.
A．has made
B．has been made
C．had made
D．had been made
吐温类溶血作用由大到小的顺序为
A．吐温80＞吐温40＞吐温60＞吐温20
B．吐温20＞吐温60＞吐温40＞吐温80
C．吐温80＞吐温60＞吐温40＞吐温20
D．吐温20＞吐温40＞吐温60＞吐温80
E．吐温20＞吐温80＞吐温40＞吐温60
