分层浇注大体积混泥土时，第二层混泥土要在第一层混泥土（）浇注完毕。
A、终凝前
B、初凝前
C、水化前
D、硬化前
参考答案：B
六、口语运用，从方框中选出正确答语填入横线上（5分，每小题1分）
C.You should learn English well. D.What’s the problem?
E.You should speak first. F.What can I do for you? G.You should go out more.
B.I’m not. I feel a little worried about my English.
A._____72_____
B. I’m not getting along well with it
A. Why not?
B. Well, I seldom have chances to meet English people.
A. ______73_____
B. Where should I go?
A. _______74_____.
B. But it seems English people never speak to me.
A. Ah! _____75_______
B. _________76_______.
A. The weather! English people are always interested in the weather.
引起小儿肺炎最常见的病毒是( )
A．腺病毒
B．柯萨奇病毒
C．流感病毒
D．呼吸道合胞病毒
