IP数据报的报头区在没有选项和填充的情况下，报头长度的值为( )。

A．4

B．5

C．1

D．32

句型转换。

1. The older girl is more outgoing.(对画线部分提问)

     _____ _____is more outgoing?

2. There are ten desks. There are ten chairs, too.(改为同义句)

     Desks are_____ _____ _____chairs.

3. This box is heavy,  That box is light.(合并为一句)

     This box is _____ _____ _____ that one.

4. Mr Green doesn't have any time this afternoon.(改为同义句)

     Mr Green _____  _____this afternoon.

5. Girls should be quiet. (用outgoing改成选择疑问句)

     _____ girls_____              _____outgoing?