同主族元素的原子具有相同的

A．最外层电子数

B．核电荷数

C．电子层数

D．核外电子数

句型转换。

1. I think it will rain. (否定句)

    I _______ think it _______ rain.

2. Can you tell me how to get to the park, please? (同义句)

    Can you tell me ______________________ the park, please?

3. Tom uses a knife to open the tin. (同义句)

    Tom _______ the tin _______ a knife.

4. These fish are sleeping. Their eyes are open.(同义句)

    These fish are sleeping ________ their eyes _______.

5. He turned around but could not see anything unusual. (同义句)

    He turned around but could see __________________________.