句型变换。

1. Hunters will kill it for its fur if they catch a giant panda. (对划线部分提问)

    __________________________ if they catch a giant panda?

2. My father always drives carefully when he sends me to school. (对划线部分提问)

    _________________________ when he sends you to school?

3. I was doing shopping when the earthquake started. (对划线部分提问)

    ______________________ when the earthquake started?

4. More and more birds are in danger because they do don't have enough living space. (改为同义句)

    More and more birds are in danger because there are _______ _______ _______ living space for them.

5. Many people do not understand how important the wetlands are. (改为同义句)

    Many people do not understand _______ _______ _______ the wetlands.

公路工程施工现场大型预制构件的底座分为平面底座和曲面底座。其中，曲面底座适用的梁底为( )。

A．等截面箱梁
B．工形梁
C．T形梁
D．曲面的箱形梁