[题目]People more and more useful things to protect the earth since Earth Day was started.A. did B. were doingC. will do D. have done 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】People ____ more and more useful things to protect the earth since Earth Day was started.

A. did B. were doing

C. will do D. have done

【答案】D

【解析】

试题分析：句意：人们已经做了越来越多的有用的事情来保护我们的地球，自从地球日建立起。根据since引导的时间状语从句可知用现在完成时have done的结构；结合句意，故选D

练习册系列答案

A. sport show B. sports show C. sports shows

【题目】Mike used to be a top student, but he _______ behind since he lost himself in computer games.

A. fell B. has fallen C. was D. has been

【题目】—I’m in Class 4. Are you in Class 4, ____?

—Yes, I am.

A. OK B. too C. and D. excuse

【题目】Have you ever had dreams about building a robot? Or putting together a spaceship? Or even seeing your face made out of chocolate? Done. All you need is a 3-D printer!

The possibilities of 3-D printing seem endless. All the user has to do is to design(设计) an object on the computer and choose a material(材料) to print in. The printers print in hundreds of different materials including glass, sugar and even skin! When the user presses “print”, the 3-D printer spreads the material layer(层) by layer and like magic the object is produced.

The first 3-D printer was invented in 1986 by an American, Charles Hull. But 3-D printing has only become cheap enough recently for most people to use. Designers now use 3-D printing to create unusual things. The Dutch artist Dirk Vander Kooj prints furniture made from old fridges. And doctors have used 3-D printing to print human body parts! The Telegraph reported in February that scientists from Cornell Medical College even printed a man-made ear.

But like a lot of new technologies, if 3-D printing gets into the wrong hands, it can be dangerous. In 2011 a group of four men in the US used 3-D printing to produce ATM skimmers (提款机盗刷器). These were placed on an ATM and stole over $400,000 from users of the ATM. It is terrible to think that criminals like them might one day use a 3-D printer to print a gun.

But for better or for worse, 3-D printing has been put into use. In a few years, you’ll probably be wondering how you could ever live without your 3-D printer!

【1】 _______ invented the first 3-D printer.

A. Charles Hull B. Dirk Vander Kooj

C. A doctor called Cornell D. Four men in the U.S

【2】What is the correct order for people to use a 3-D printer?

a. Choose a proper material.

b. Press the print button.

c. The 3-D printer spreads the material.

d. Use a computer to design an object.

A. a-b-c-d B. d-a-b-c

C. a-c-d-b D. d-c-b-a

【3】The underlined word “criminals” in the fourth paragraph might mean ______________ in Chinese.

A. 技术员 B. 军人 C. 罪犯 D. 用户

【4】According to the passage, people have NOT yet produced _________ with a 3-D printer.

A. some furniture B. a man-made ear

C. ATM skimmers D. a gun

【5】What does the writer think of the 3-D printer?

A. It is necessary only for our work.

B. It is helpful but dangerous.

C. It is too expensive for most people.

D. It is useless in our daily life.

【题目】 —Lily, _________ apple on the table is for you.

—Thanks, Mum. _________apple a day is good for us.

A. the; An B. an; An

C. an; The D. the; The

【题目】--- _____ ?

--- Under the table.

A. Is that your radio B. Where’s your radio

C. Can I see your radio D. What about your radio

【题目】—How could you get such a good idea?

—What my father said made me excited, and then I ____ the idea.

A. put up with B.caught up with

C. kept up with D. came up with

【题目】 --- Here’re some _____. Are they yours?

--- No, mine _____ red. They’re in my schoolbag.

A. pencils; is B. pencil; is

C. pencils; are D. pencil; are

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