句型转换。

1. Please be very quiet in the classroom. (改为否定句)

    Please______very quiet in the classroom.

2. I like dolphins because they are friendly. (对画线部分提问)

    __   _    you like dolphins?

3. Where do you come from? (改为同义句)

    Where_____you ____  ?

4. We can't finish the work without your help.(用 if 变换句子)

    We can't finish the work_____you_____us.

5. There is a football club near here. (改为一般疑问句)

               a football club near here?

关于子宫的描述，正确的是（ ）。

A．成年女子的子宫长约7~8cm，宽约4~5cm，厚约4~5cm

B．宫体与宫颈之间最狭窄的部分为子宫峡部

C．幼年时宫体和宫颈的比例是2：1

D．子宫峡部上端是组织学内口

E．子宫峡部下端为解剖学内口