Henry is a little fatter than he wants to be.He wants to lose some weight （减轻重量）.He tries not to eat too much and he eats very little sugar because it will make him fat.He also does exercise every day.He swims,and he runs about two miles a day.Now he is stronger than before.Henry’s sister,Susan, is healthier than Henry.She is also younger and thinner than he is.She does exercise every day.She doesn’t eat much meat.She eats a lot of fruit and vegetables, because she thinks they are better for her health.

小题1:Henry wants to be_______

A. a little fatter                    B.a little thinner

B.a little older                     D.a little younger

小题2:Which will make people fat?

A．Meat and fruit

B．Sugar and meat.

C．Fruit and vegetables .

D．Vegetables and sugar.小题3:Susan is __________ than Henry.

A．younger but fatter

B．older and healthier

C．thinner but not stronger

D．thinner and healthier.

主减速器一般有两种结构形式：一种是（）主减速器，由一对常啮合圆锥齿轮组成。另一种是（）主减速器，由两对常啮合齿轮组成，一对为锥齿轮，一对为圆柱齿轮。