问题 填空题

空气是一种重要的自然资源,请回答下列问题。

(1)近年来,大气中二氧化碳含量不断上升,带来的环境问题是________。自然界中消耗二氧化碳的途径是___________。科学家正在研究将过多的二氧化碳和氢气在催化剂和加热的条件下反应,转化为水和甲烷。这个反应的化学方程式为________________。

(2)铁与空气中的________等物质发生复杂的化学反应,生成铁锈,影响金属材料的有效利用。找出一种铁制品并说明它是怎样防锈的________________。铁制品一旦生锈,可以用稀盐酸除锈。除锈时观察到__________的现象,写出反应的化学方程式___________________。

答案

(1)温室效应;光合作用(或海水吸收);CO2+4H22H2O+CH4

(2)水、氧气(或H2O、O2);铁栏杆-喷漆(或链条、涂油或洗脸盆、搪瓷或门把手、电镀等);铁锈逐渐消失,溶液由无色变黄色;Fe2O3+6HCl==2FeCl3+3H2O

阅读理解

Emma and Hannah are 13–year–old school girls from Minnesota,USA.They are good at making new thing s and both of them are also good at sales.They are selling charms(小装饰物) made out of bottle caps.

The girls came up with the idea last summer when they saw charms were popular with kids.

They talked with their parents about the idea.Since then they have sold enough charms to buy a bike for Hannah.

The girls collect bottle caps and then clean them.They find some interesting pictures on the Internet or on paper,and then glue them onto the inside of the caps.There are different kinds of pictures,“Peace signs are popular with girls,and single–letter charms are popular with boys whose names start with those letters,”Emma and Hannah said.

Now,charms can be found everywhere at Dakota Hills Middle School in Eagan.“Students put charms on purses,backpacks ,and their lunchboxes,”said Emma.Emma and Hannah also have a shop on the Internet.They hope they can sell their charms to more kids.They’re thinking about selling their charms at the Eagan Market Festival next summer.

Their business is not only for getting money.At their Valentine’s sale,20%of the income( 收入) went to charity.

小题1:What are Emma and Hannah?

A.They’re waiters.

B.They’re sellers.

C.They’re students.

D.They’re charm makers.小题2:When did the girls begin to sell the charms?

A.About a year ago.

B.About two months ago.

C.Nearly fifty days ago.

D.Nearly five weeks ago.小题3:Which of the following may NOT be on the charms?

A.Pictures.

B.Signs.

C.Letters.

D.Numbers.小题4:What do Emma and Hannah hope to do now?

A.They hope to become rich people.      B.They hope to give money to charity.

C.They hope to sell more charms.        C.They hope to sell charms in every school.

小题5:Which of th following is TRUE?

A.The two girls love their parents and money.

B.Boys like charms with signs.

C.They won’t sell charms next smmer.

D.The charms are popular with students.

多项选择题