以下说法中，正确的有（）。

A.投机者的参与增加了市场交易量

B.投机交易使市场的价格变化走势出现分歧

C.投机者承担了套期保值者所希望转嫁的价格风险

D.期货投机与套期保值是期货市场不可或缺的两个基本因素

句型转换。  

1. She has math at eight o'clock.(改为一般疑问句)

     _____ she _____ math at eight o'clock?

2. They have some sports clubs.(改为否定句)

    They_____have _____ sports clubs.

3. My favorite subject is biology.(对画线部分提问)

    _____ _____ favorite subject?

4. He likes science because it's interesting.(对画线部分提问)

    _____ _____he like science?

5. Mr Wang is our math teacher.(对画线部分提问)

    _____is_____math teacher?