问题 填空题

如图所示的两种剪刀,正常使用时属于省距离的杠杆是______剪刀(选填“甲”或“乙”).根据功的原理,使用这两种剪刀都不省______.

答案

剪刀使用时省距离的杠杆一定费力,所以动力臂小于阻力臂,即“把短刃长”,如图乙;

根据功的原理,无论使用哪种剪子,都不省功;

故答案为:乙,功.

单项选择题
阅读理解

Women’s fashions change more rapidly than men’s. In the early 1990’s, all women wore their skirts to the ankle. Today, some skirts are even longer than before, but some are very short. Women’s shoes have also gone through all sorts of boots for women were very common at the beginning of this century. Then for years, they were not considered fashionable. Today, they’re back again in all colours, lengths and materials. In fact, today’s women can wear all types of clothes on almost any occasion. While all of these changes were taking place in women’s fashions, men’s clothing remained almost the same until a few years ago. And, in fact, most men are still dressed in the kinds of clothes they used to wear.                                                                                                               

小题1:What kind of skirts do women like to wear today?

A.Long skirts.

B.Short skirts.

C.Both long skirts and short skirts.

D.Neither long skirts nor short skirts.小题2:Now boots are considered ______now.

A.fashionable

B.unfashionable

C.uncommon

D.fit for girls most小题3:When today’s women go to the party, they wear _______.

A.skirts down to the ankle

B.red long boots

C.long skirts and short boots

D.any kinds of clothes they like小题4:The passage tries to tell us _______.

A.boots for women have been thought fashionable since 1900

B.women’s shoes are back again in all colours, length etc.

C.today men are dressed in the kinds of clothes they used to wear

D.fashions for clothes, shoes and so on always change