While you are heating your food, you may wond...

While you are heating your food, you may wonder how close you can safely stand next to a microwave, and whether any radiation could escape from the device and potentially harm you.　

In theory, microwaves can heat body tissues in the same way they heat food, and at high levels, microwaves can cause burns and cataracts. 1. They will generally occur when people are exposed to large amounts of radiation escaping through openings in the oven. As a result, there is little cause for concern about using microwaves ovens, unless there is damage to the door.

Still, the FDA (美国食品和药物管理局) recommends that you check your microwave oven carefully and do not use it if the door doesn't close properly, or if it is "bent, warped, or otherwise damaged."　 2.

As far as injuries from microwave ovens go, the most common way people are injured is via heat-related burns from touching hot containers or overheated foods, or being exposed to exploding liquids. 3.

The agency also warns that, when you use a microwave to heat water in a cup, there's a risk of the water becoming "superheated," which means it has heated past its boiling point. 4.But just a slight disturbance to the water — which can occur when touching or picking up the cup — can cause an eruption of boiling water. This can lead to skin burns or scalding injuries, particularly on the face and hands. To prevent superheated water from forming, the FDA says people should not exceed the recommended heating time for water, as indicated in the oven's instruction book.

5.

A.But these types of injuries are very rare.

B.When this happens, the water does not appear to be boiling.

C.However, injuries from microwave radiation are unavoidable sometimes.

D.Though microwaves don't affect health as X-rays do, that doesn't mean they are risk-free.

E.People should use common-sense precautions when handling hot foods in microwaves.

F.Indeed, it's a good idea to follow the instruction book to help keep yourself safe when using it.

G.Besides, it is suggested that you don't lean against a microwave for too long during operation.

高三英语七选五中等难度题查看答案及解析

—I wonder how much you charge for your services.

—The first two are free　　　　 the third costs $30.

A. while　　　　　　　　 B. until　　　　　　　　　 C. when　　　　　　　　 D. before

高三英语单项填空中等难度题查看答案及解析

B

You know how wonderful you are, and you know that others know how wonderful you are, but what do you do when admiration crosses over the line into jealousy(嫉妒)? For most teens there will come a day when you realize that one of your friends is jealous and that this jealousy is hurting your friendship. When this happens it can seem like there is nothing that you can do, but the good news is that there is. Don’t let jealousy spoil your relationships. Deal with it confidently and you might be back to normal much sooner than you think.

It can be hard to walk up to a friend and ask them what the problem is, but if you want to save your friendship you’ll have to do just that. Don’t approach them and ask why they are jealous of you unless of course you want to appear totally conceited (逞能), just take some time alone with them and let them know that you’ve been feeling like there’s been something coming between you. If they refuse to respond, then use the opportunity to explain how you have been feeling. Chances are that something you say will strike a nerve and your friend will open up as well.

When you figure out what is annoying your friend, ask him or her what (s)he thinks would make the situation better. If, for example, (s)he says that (s)he feels like (s)he doesn’t get to spend any time with you because of your being off with your new friends from the swim team then maybe you could invite her along the next time or block off one day a week for just the two of you. Remember, though, that whatever solution you decide on should be a compromise. Don’t limit your own talents or opportunities simply because your friend is unhappy. Try instead to include him or her in your new life and see how that works out.

Even the best of friendships can be ruined by jealousy. This destructive emotion is rarely productive and can turn best friends into worst enemies. Before taking extreme action, chat with your jealous friend to see if the two of you can work out a compromise. If you can’t, be prepared to know exactly how far you will go to keep your friend and how far you won’t.

1.According to the author, the jealousy emotion is________.

A. normal　　 　　　 B. productive

C. destructive 　　 D. extreme

2.What does the author intend to tell us in paragraph 2?

A. How to solve the problem of jealousy.

B. Why we need to solve the problem of jealousy.

C. How to explain your jealousy to your friends.

D. Why it is hard to deal with the problem of jealousy.

3.What can be inferred from the last two paragraphs?

A. There’s always a solution to solve the problem of jealousy.

B. Jealousy can turn best friends into worst enemies.

C. You may lose a friend to keep your own gifts, chances or self development.

D. You should go a long way with your friend to work out a solution

4.This passage is mainly intended for________.

A. female readers

B. students

C. teenagers

D. best friends

高三英语阅读理解中等难度题查看答案及解析

—John, why just stand there with your mouth closed? You are expected to air your

opinion.

—________.You have another supporter in me.

A．I'm with you on that　             B．I'm through

C．Nonsense                          D．Hold your tongue

高三英语单项填空中等难度题查看答案及解析

Did you ever wonder how some of your favorite foods, products or toys came about? Believe it or not, they may have been an accident, or a failure of some other intention．Below, we found three mistakes we're thankful for turned out to be what they are.

.1．Most historians hold that the Chinese invented fireworks in the 9th century when they discovered how to make gunpowder．Story has it that a Chinese cook accidentally mixed together what were then considered common kitchen items and noticed they burnt．When put tightly in a bamboo tube and lit, it blew up．

.2．In May of 1886, a law led John Pemberton, a pharmacist（药剂师）, to rewrite the formula（配方） for "Pemberton's French Wine Coca,” his popular headache treatment．Containing sugar instead of wine as a sweetener, the outcome became something for Coke, which was later mixed with carbonated water．His bookkeeper suggested the name Coca-Cola because he thought the two C’s would look good together, which is how what we call Coca-Cola, a world –wide drink came into being.

.3．During World War II, scientists at the University of Birmingham invented the magnetron—an important heat-producing part of the microwave oven（微波炉）．While working for Raytheon Corporation after the war, the American engineer Percy Spencer was testing the magnetron when a chocolate bar in his pocket melted．He went on to test other foods including popcorn kernels, and found it to be a much more efficient way to cook．In 1947 Raytheon came out with the first restaurant microwave oven, which was six feet tall and weighed 750 lbs．

1.The right time order of the three inventions, according to the passage, should be    _________.

A．fireworks, the microwave and Coca-Cola

B．fireworks ,Coca-Cola and the microwave

C．Coca-Cola , fireworks and the microwave

D．the microwave, Coca-Cola and fireworks

2.Percy Spencer found the microwave efficient in cooking when he was _______.

A．looking for a way to melt his chocolate

B．trying to know how a magnetron could cook

C．working to know how the magnetron works

D．asked to invent a restaurant microwave oven

3.What can we learn from the above invention stories?

A．Experiments make great inventors of our time.

B．Nothing is impossible if one tries each day.

C．Inventors come out of hard work at any time.

D．A small incident may lead to a great invention.

4.What’s the best title for the passage?

A．What great inventions they are!            B．Inventions from Three Countries.

C．Stories of Accidental Inventions.           D．The Human Inventions of time.

高三英语阅读理解中等难度题查看答案及解析

While your pet fish may appear to be ignorant of your presence, chances are that it knows you extremely well and can probably even identify you from a crowd of human faces! At least, that is the conclusion reached by scientists the University of Oxford in the U.K. and the University of Queensland in Australia, following an extensive study of the archerfish (喷水鱼), a species of tropical fish that can be found all the way from India to Indonesia, the Philippines, and Australia.

The ability to distinguish between human faces is a complex task. That’s because we all have the same basic features — two eyes sitting above a nose and a mouth. It’s only the subtle differences that make humans distinct from one another. Since this requires a combination of both visual sense and memory, researchers had always assumed that it was a skill possessed only by those with complicated brains, i.e., humans, a few select animals — such as horses, cows, dogs, monkeys and some birds, like pigeons.

To test if this assumption was accurate, a team of scientists led by Dr. Cait Newport, Marie Curie Research Fellow in the Department of Zoology at Oxford University, decided to study fish. The aquatic (水生的) animals have small brains that lack the neocortex（大脑新皮层）, or neocortex-like structure, believed to help recognize the subtle differences between human facial features.

The team began by presenting four archerfish with images of two human faces. Initially, the fish spat randomly at both. However, they soon learned that pouring water at the one selected by the researchers earned them a food treat. After that, they focused primarily on that image. The researchers then took the experiment one step further, by introducing 44 other human faces to the mix.

To the researcher’s astonishment, the trained archerfish were able to recall the learned image almost 81% of the time. And this accuracy improved to 86% when the researchers made the identification even harder, by replacing the colored photos with a set of black and white images and hiding the shape of the head.

1.What is the conclusion of the study made by the scientists from the universities?

A. Some fish may ignore your presence.

B. Some fish can recognize your faces.

C. Some fish have complicated brains.

D. Some fish have large brains.

2.What does the underlined word “it” in Paragraph 2 refer to?

A. The ability to distinguish between human faces.

B. A combination of visual sense and memory.

C. The ability of memorizing complicated things.

D. The ability of telling beasts from birds.

3.In the experiment, the researchers trained the archerfish _______.

A. by taking photos of fish

B. by improving people’s images

C. by rewarding them with food

D. by covering their heads

高三英语阅读理解中等难度题查看答案及解析

Look closely at ,your hands-are they clean? It doesn't matter how many times you was  your hands. They're still crowded with microbes, which are also called "germs" or "bacteria". Microbes are everywhere. But don't worry-most microbes don't harm you. and many actually help you stay alive.

Now,  scientists say the microbes that live on our hands could be used in a surprising way: fighting crime.

When police visit the scene of a crime, they often look for fingerprints to try to identifythe criminal.  But according to a recent study, investigators could even use microbes to help break a criminal case.

Every person has his or her own set of microbes that live on their hands, according to scientists at,the University of:Colorado. That means the mix of different kinds of microbes on everybody's hand is unique-much like one's fingerprint.

The scientists wanted to know whether this microbe mix could be used as a new kind of fingerprint-especially in a crime scene where fingerprints might be hard to find.  And policemen use forensics such as studying fingerprints to identify the criminal.

"Microbe fingerprints are harder to hide," said Noah Fierer, one of the scientists.

"You can't sterilize(为……杀菌) a surface just by wiping it off. "

His team compared the bacteria on the hands of 273 people with the bacteria found on each person's computer keyboard. For the study, the keyboards had been used only by the people who were being tested. The study showed that the mix of microbes from each per- son's hands matched the mix of microbes on that person's keyboard. The scientists were easily able to tell the 273 people apart-just by looking at their keyboards.

But there are a lot more than 273 criminals. Other scientists wonder whetherthe microbe fingerprint can really be that useful.

Fierer agrees that scientists have a lot more work to do before the microbe fingerprint will be a useful tool．

1.According to the passage,  microbes on people's hands_____

A．do more harm than good                 B．are easy to get rid of

C．are almost the same                     D．might help find crimes

2.The underlined word "forensics" in Paragraph 5 probably refers to________.

A．the scientific test used by police

B．a new kind of fingerprint

C．a kind of bacteria'in people's hands

D．a kind of newly invented keyboard

3.What did Fierer's team find through the study?

A．They found the criminal among the 237 people.

B．They could tell who had used which computer.

C．Computer keyboards couldn't keep people's microbe fingerprints.

D．People's characters could be identified by the keyboards they used.

4.We can learn from the passage that ______.

A．your microbes may give you away

B．scientists will come to a clear conclusion soon

C．many scientists think microbe fingerprints useless

D．the microbe fingerprint has been used in many cases

5.The main idea of the passage is about_____.

A．the importance of fingerprints             B．how to clean our hands

C．the usefulness of microbes                D．different germs on our hands

高三英语阅读理解中等难度题查看答案及解析

When you are at odds with someone close to you，the One-Minute Drill can show you how to express your feelings effectively-and how to listen more skillfully．All it requires is two individuals who are committed to improving their relationship．

Set aside at least ten minutes，and then sit facing each other．Decide who will be the Talker and who will be the Lastener．It makes no difference，because later you will change roles．

How to perform the One-Minute Drill

For approximately 30 seconds，the Talker can say anything he or she wants．Your job will be to express your thoughts and feelings．You can discuss problems you’ve had a hard time talking about．Remember to limit yourself to about 30 seconds．When the Talker finishes，the Listener will summarize what the Talker just said，as well as how the Talker was feeling inside，as accurately as possible．

The Talker now gives the Listener a grade between 0 and 100 percent to indicate how accurate the summary was．If the rating is 95 percent or more，you can change roles；the new Talker can continue with the same topic or move on to something entirely new．

However，if the grade is below 95 percent，the Talker should point out what the Listener missed or got wrong，and repeat the process until the overall rating is 95 percent or more．Then you can change roles and repeat the exercise for as long as you both like．

How it works

Thirty seconds of emotionally charged information is sufficiently challenging for anyone．Express your feelings in strong，clear，direct language，but as your partner will be listening attentively，you won’t need to shout，exaggerate or put your partner down．

The Listener should sit and listen respectfully without interrupting．Look into your partner’s eyes，but avoid using negative body language． If you like，take a few notes．

So the Talker might say：“When I come home from work， I feel tired and I need some quiet time．But you tell me I’m supposed to spend time with the kids．This makes me feel frustrated．I work hard and I’m exhausted at the end of the day．I feel like I deserve a little time to relax，not listen to more demands．”

In response，the Listener might summarize like this：“You just told me that you feel exhausted when you come home at night because you’ve been working hard all day．When l tell you l want you to spend time with the kids，you feel frustrated and ticked off because you’re tired and you need time to relax．You see me as very demanding，and you’re probably feeling like I don’t appreciate you．”

The first time you attempt the One-Minute Drill，you may get a low score．Don’t worry，because you’ll get up to speed quickly．Once you’ve tried this exercise a few times，you’ll find that you can nearly always get ratings of 95 percent or better on the first or second try．

1.Who is the One-Minute Drill intended for？

A．Those who are preparing for the interview in order to make a good first impression．

B．Those who have difficulty communicating with their colleagues or family members．

C．Those who have troubled relationships with their friends or family members and try to improve them．

D．Those who are to act some roles in a certain play for the first time in their life．

2.Which of the following is NOT true？

A．The Talker should talk about his/her thoughts and feelings in a brief way．

B．The Listener should listen carefully，respectfully and later summarize accurately．

C．After the Talker finishes talking，the Listener is to give him/her a grade．

D．In the One-Minute Drill，the Talker and the Listener change roles in the process．

3.From the example given in“How it works”，we can guess that the talk might be between ________．

A．father and son                   B．mother and daughter

C．sister and brother                                 D．husband and wife

4.What does the underlined part“ticked off”probably mean in this reading？

A．very angry                       B．burst into tears

C．marked with a symbol     D．fast asleep

高三英语阅读理解中等难度题查看答案及解析

— I wonder how much you charge for your services．

— The first two are free _______the third costs $30．

A．while             B．until　　          C．when             D．before

高三英语单项填空中等难度题查看答案及解析

– I wonder how much you charge for your services.

-- The first two are free ________the third costs $30.

A. while                                B. until

C. when                                D. before

高三英语单项填空中等难度题查看答案及解析