句型转换

1. Football is more exciting than volleyball. (改为同义句)

    Volleyball isn't __________ exciting __________ football.

2. The Tab Bat is 83 yuan and the Bon Bon is 75 yuan. (同上)

    The Tab Bat is __________ __________ than the Bon Bon.

3. We prefer basketball to volleyball.(同上)

    We like basketball __________ __________ volleyball.

4. I think the white ones are cheaper than the black ones. (改为一般疑问句)

    __________ __________ think the white ones are cheaper than the black ones?

5. They play their CDs loudly. (就画线部分提问)

    __________  __________ they play their CDs?

人体循环系统的结构中，不存在瓣膜的是（　　）

①动脉内

②静脉内

③毛细血管内

④房室之间

⑤心室与动脉之间

⑥心房与静脉之间．

A．①④⑤

B．①③⑥

C．④⑤⑥

D．②③⑥