第一种工作票应在工作批准期限前（）小时，由工作负责人向调度值班员申请办理延期手续。
A.1
B.2
C.4
D.8
参考答案：B
There are some _______ in our city. We can read books, newspapers and magazines in them. [ ]
A. animals
B. libraries
C. airports
D. banks
What concern will the test-tube baby raise according to the passage
A．Whether the pregnancies of test-tube babies would be normal.
B．Whether the test-tube babies would be encouraged.
C．Why the proportion of defected babies is so high.
D．Why the number of Caesareans is so high.
