睡觉前才刷牙是错误的！

Do you brush your teeth before bed every night? This good habit may be wrong.

1.1.Doctor Zou Duohong is from Beijing.

A T.

B F.

C

D

解析：选B。B 细节理解题。第二段说“Doctor Zou Duohong from Shanghai”，医生来自上海，不是北京。故选B。

2.2.We should brush teeth half an hour after dinner.

A T.

B F.

C

D

解析：选A。A细节理解题。第二段“Brush your teeth 30 minutes after dinner.”建议饭后30分钟刷牙，即半小时。故选A。

3.3.Food in the mouth is good for us.

A T.

B F.

C

D

解析：选B。B细节理解题。第三段“food left in your mouth makes bacteria (细菌). The bacteria are bad for your oral health.”说明嘴里残留的食物会产生细菌，对口腔健康有害。故选B。