关于细菌内毒素，正确的是

A．细菌的菌体成分

B．性质不稳定

C．细菌蛋白质

D．特异性作用

E．能刺激机体产生抗体

完成下列句子的同义表达

1. John is better at playing football than Peter.

    John __________ __________ __________ playing football than Peter.

2. Why don't you ask our English teacher for help?

    __________ __________ __________ our English teacher for help?

3. Yes, I agree.

    Yes, I have __________ __________ idea __________ you.

4. Betty's mum doesn't think that today people eat as well as in the past.

    Betty's mum thinks that today people eat __________ __________ in the past.

5. Now we don't have as much free time as we did before.

    Now we have __________ __________ __________ than we did before.