维生素D缺乏性佝偻病激期血生化的特点是（）。

A．血清钙正常，血清磷降低，碱性磷酸酶降低

B．血清钙降低，血清磷降低，碱性磷酸酶增高

C．血清钙降低，血清磷正常，碱性磷酸酶增高

D．血清钙降低，血清磷增高，碱性磷酸酶降低

E．血清钙正常，血清磷降低，碱性磷酸酶增高

句型拓展。

1. He is staying there for a week (划线部分提问)

    _____ _____is he staying there?

2. What's the weather like today? (同义句)

    _____ _____the weather today?

3. Mike is going to Beijing with his father. (划线部分提问)

    _____is Mike going to Beijing_____?

4. What are you going for vacation? (作回答)

    ____________________________________.

5. Can he rent videos? (作肯定回答)

______________________________________.