开孔刀的刀齿一般由（）个构成一组。A、1 B、3 C、4 D、5

下列叙述正确的是（　　）

A．硫酸钡难溶于水，但硫酸钡是电解质

B．稀H₂SO₄溶液能导电，稀H₂SO₄是电解质

C．H₂SO₄在电流作用下在水中电离出H⁺和SO₄^2-

D．氯气的水溶液能导电，所以氯气属于电解质

请仔细阅读小题，从A、B、C、D中找出其相对应的选项，并回答第5小题。

You don’t have to be bored on a rainy day. Here are some new ideas:

Tell stories. You might tell stories you have heard before, or you might make up some really wonderful stories.

小题1: You can learn to cook a pizza or maybe some cookies. Give your friends a chance to help in the kitchen and make something tasty.

小题2:You might write stories on your own and then read them aloud to others, or you might write a story together.

小题3:Think of some scenes and then play a game. Act as teachers, doctors, nurses or policemen. You can dress up in whatever you may have.

小题4:Pick out some music and dance around in the room. You can also sing while others are dancing.    

So on the next rainy day, try some of these ideas for a day full of fun!

A．Cook in the kitchen

B．Play “Let’s act” game

C．Write a story together

D．Have a party小题5:This passage is mainly about ___________

A．How to tell and write stories

B．How to play a game

C．How to spend a rainy day

D．How to make something tasty

读图回答．

（1）填出人口稠密区A______，B______，这里是人类______生产发展最早的地区．

（2）填出人口稠密区C______，D______，这里是现代______生产最发达的地区．

（3）下列人口稀少区的气候类型名称是：E处于______气候，F处于______气候，G处于______气候，H尚未定居人口的原因是______．

What would you do if you cut yourself _        .               [ ]

A. by mistakes      

B. by accident      

C. by change

据《素问·汤液醪醴论》，中古之世做汤液醪醴是（）。

A.为而不用，以为备耳

B.服之万全

C.服之亦不必已

D.配合针石

E.配合薰浴