小题1:B
小题2:C
小题3:D
小题4:D
小题5:C
小题1:细节题。结合Mike, doesn’t have very nice teeth, so that is why he seldom opens his mouth. He even says that he has lost confidence because of his teeth可知答案。
小题2:细节题。结合many people don’t smile because they think they have ugly teeth. 可知答案。
小题3:细节题。结合If your teeth are in bad shape, you should see a dentist and ask for help. They can help improve your teeth and tell you how to take care of them. 可知答案。
小题4:细节题。结合If you want to keep healthy, you should not only smile but also laugh. 可知答案。
小题5:细节题。结合An Indian doctor called Kataria said that young children should laugh about 30 times a day可知答案。