Where is the book?[ ]
A. There it is.
B. It's a book.
C. My name is Jenny.
答案：A
做功的快慢用______表示．某台机器的功率为80W，表示______．
孕妇学校的授课对象应包括
A．孕妇B．孕妇及其同事C．孕妇及其家属D．家属E．家属及其同事
