--- Jack， you look so great！--- Thanks! I hav...

--- Jack， you look so great！

--- Thanks! I have lost 20 pounds since I ______ my personal trainer six months ago．

A． hired　　　　 B． have hired

C． hire　　 　 D． had hired

高三英语单项填空中等难度题查看答案及解析

—Hi, Jack．You look a bit fat now．

—Yes, I ______ five pounds recently．

A．am putting on　　　　　　　　　     B．will put on

C．have put on　　　　　　　　　　　　     D．had put on

高三英语单项填空中等难度题查看答案及解析

Like most people, you have probably lost count of the number of perfect-looking shoes you have thrown away simply because the rubber soles (橡胶鞋底) are broken. In addition to the expense, it is also harmful to our environment. Now, thanks to a revolutionary self-healing 3-D printed rubber material, broken shoe soles may be a thing of the past.

The magical polymer (聚合物) is developed by the researchers at the University of Southern California’s (USC) and the University of Connecticut (UConn) . The team, led by USC Assistant Professor Qiming Wang, created it through a process called photopolymerization, which uses light to solidify the liquid used to create 3-D printed plastic. The researchers found that adding the right amount of oxidant (氧化剂) to the liquid allowed the 3-D polymer to heal (愈合) without slowing down the hardening process.

“When we gradually increase the oxidant, the self - healing behavior becomes stronger, but the photopolymerization behavior becomes weaker,” explained Wang. “There is competition between these two behaviors.”

The team, who published the findings in the journal NPG Asia Materials on February 1st,2019, state that the repair time can be reduced by increasing the room temperature. “If you just put a broken shoe on a bench at room temperature, the rubber will heal itself in six to eight hours,” Wang said. “If you apply heat at maybe 60℃, that expedites the healing process to about two hours.”

Given the material s huge potential, it is not surprising to hear that Wang and his team have been approached by several shoe-making companies eager to be the first to use the technology, which is still in the early stages. Once perfected, the scientists also hope to apply the technique to hard plastics that can be used to create self-healing toys, electronics, vehicle parts, and, if Wang has his way, even tires.

1.How do the researchers make 3-D printed plastic self- heal?

A.By changing the amount of light used.

B.By raising the temperature at which it is used.

C.By increasing the hardening speed of the liquid.

D.By adding the proper amount of oxidant to the liquid.

2.What can be inferred from the text?

A.The creation of 3-D printed plastic doesn’t need light.

B.The surrounding temperature determines the speed of healing.

C.Many shoe making companies got the right to use the technology.

D.Throwing away broken shoe soles has been a thing of the past.

3.What does the underlined word “expedites” mean?

A.Strengthens. B.Delays. C.Accelerates. D.Worsens.

4.Which of the following can be the best title of the text?

A.Self - healing shoes may be in our future.

B.3-D printing technology makes a difference.

C.Self - healing technology will serve many fields.

D.A revolution of rubber soles has changed our life.

高三英语阅读理解困难题查看答案及解析

(2013·合肥模拟)—Go and have great fun! I will cope with　　you leave to me properly.

—Thanks a lot.

A. why            B. when        C. what        D. which

高三英语单项填空简单题查看答案及解析

—Go and have great fun! I will cope with _____ you leave to me properly.

—Thanks a lot.

A. why                         B. when                       C. what                                  D. which

高三英语单项填空中等难度题查看答案及解析

—Go and have great fun! I will cope with _____ you leave to me properly. —Thanks a lot.

A. why                  B. when                C. what                        D. which

高三英语单项填空简单题查看答案及解析

---Can I help you, sir?

---No, thanks．I _____ around．

A．have just looked                                  B．have just been looking

C．am just looking                                  D．just look

高三英语单项填空困难题查看答案及解析

— ____?

— No, thanks. I’m just looking around. I’ll let you know if I want anything.

高三英语单项填空简单题查看答案及解析

Can you give me some advice on how to _____ the time I have lost?

A. look up to       B. make up for              C. put up with    D. break away from

高三英语单项填空中等难度题查看答案及解析

—What’s wrong with you? Why do you look so sad?

— ______ ! I’ve lost all my files on the computer. It is total disaster.

A.Go to the bad B.Come off it C.Just my luck D.Count my blessing

高三英语单项填空简单题查看答案及解析