短文填空。

    根据短文内容和首字母提示，把所缺单词填写在短文后面相应的横线上，使句意完整。

    When you laugh, you will o  1   your mouth and show your teeth. The healthier those teeth are, the happier you look. Why is that?

    It’s because your teeth are important in many w  2   . If you take care of them, they’ll help to take care of you. Strong healthy t  3   help you eat the right food to help you grow. They also help you speak clearly.

    Brush your teeth t  4    a day-after breakfast and before bedtime.

    You also need to care about w  5   you eat and drink. Eat lots of fruits and vegetables and drink water instead drinks.

1.___________  2.___________  3.___________  4.___________  5.___________

假设在一定时间内，某个生态系统中的全部生产者所固定的太阳能总量为a，全部消费者所利用的能量为b，全部分解者所利用的能量为c，能正确反应三者关系的是（　　）

A．a=b+c

B．a＞b=c

C．a＞b+c

D．a=b=c