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    Every woman dreams of receiving a huge sparkling and priceless diamond.Now scientists have discovered the largest diamond in the universe.
    But it's well beyond the reach of the most lovestruck men―50 light years to be precise.Space scientists revealed that they had discovered a ten billion trillion trillion carat gem.Measuring 2，500 miles across and weighing five million trillion trillion pounds，the rock was found on Valentine's Day buried in the core of a white dwarf star（白矮星） in the constellation Centaurus（人馬座）."
    Ifs the mother of all diamonds，" said Travis Metcalfe，who led the team of researchers at the Harvard-Smithsonian Centre for Astrophysics in America."
    You would need a jewelry's loupe（小型放大鏡） the size of the Sun to grade this diamond." Named Lucy.after the Beatles' song Lucy in the Sky with Diamonds，the rock has sent a ripple of excitement through the scientific world.
    The largest diamond found on earth was the 3106-carat（克拉） Cullinan.It was cut into nine major stones，including the 530-earat Star of Africa now a part of the Crown Jewels.Diamonds were first discovered in India more than 2800 years ago.The Ancient Romans believed that the stones were thin and sharp pieces of stars that had fallen downward to earth.
    In Ancient Egypt diamonds were symbols of eternity（永恒） and were used in funeral ceremonies.In the Middle Ages men wore them to symbolize their courage，strength and energy.The tradition of giving them as love tokens dates from 1477，when Archduke Maximilian of Austria gave a diamond ring to Mary of Burgundy.

（1）The largest diamond in the universe
B
B
.
A．was found 50 years ago
B．was in the centre of a white dwarf star
C．was too large to measure
D．could be graded by a common jewelry's loupe
（2）What does the underlined word"tokens"mean in the last paragraph？
A
A

A．Symbols.
B．Matches.
C．Souvenirs.
D．Tests.
（3）You can probably read the passage in
D
D
.
A．a(chǎn) tour guide
B．a(chǎn) poster
C．a(chǎn)n official document
D．a(chǎn) magazine
（4）Which of the following best serves as the title？
C
C

A．Diamond—a must on important occasions
B．Love—the symbolism of diamonds
C．Discover —the largest diamond in the world
D．Diamond—the dream of women

【考點】說明文；自然科學(xué)研究成果．

【答案】B；A；D；C

【解答】

【點評】

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發(fā)布：2024/7/16 8:0:9組卷：0引用：1難度：0.5

相似題

1．Earthquakes happen without warning（前兆）.They can happen any time of a day，at any point during the year.But don't worry because most are so weak that they cannot be felt.Only a few big ones hurt people.However，it's important to know what to do when an earthquake is happening.
   Do not go outside.You could get injured from falling glass or parts of buildings.If you are outside，stay away from buildings and power lines （輸電線）.
   Stay under a desk，table，or other strong furniture.Hold on to it.Or stay in a corner of the building.Cover your face and head with your arms and cover your mouth with a towel or clothing.Stay inside until shaking stops and it is safe to go outside.
   Keep away from windows，pictures or advertisements on the wall or the building，and anything else that could fall and hurt you.Most people get injured by falling things during an earthquake，not by the shaking itself.
   Also keep away from a fire.You could fall down and burn yourself in the fire.
   If you are driving when an earthquake happens，stop the car if it's safe.Stay inside your car until the earthquake stops，and don't drive near bridges.Try not to stop by power lines or trees.These could fall and hurt you.

（1）Most earthquakes are too

to hurt people.
A．strong
B．weak
C．dangerous
D．heavy
（2）From the passage，when an earthquake is happening，we should

.
A．stay under a big building
B．stay under a strong furniture
C．stand by windows
D．drive near a big bridge
（3）It isn't safe for you to

while the earthquake is happening.
A．run out of the building
B．stay in a corner of the building
C．cover your head with your arms
D．cover your mouth with a towel
（4）What's the main idea of the passage？

A．How dangerous the earthquake is.
B．How to be safe in an earthquake.
C．We shouldn't be afraid of the earthquake.
D．How the earthquake comes into being.
發(fā)布：2024/10/29 12:30:2組卷：5引用：1難度：0.5
解析
2．What do you use your fridge for：It can not only keep your food cold，but also make ice and freeze food．But in the future smart fridges may do much more than you can think．They may tell you what food is inside，what food you need，what food is healthy for you，and even shop for you，too!
   Some companies are making online fridges which have a computer screen on the door．And it can be very useful that the computer is linked to a supermarket through the Internet．For example，when you finish your orange juice，you can put the empty juice carton（紙盒包裝） near the computer screen．The computer reads the bar code on the juice carton．Then it orders more orange juice from the supermarket．You can also use the computer screen to order other things from the supermarket．The computer screen has a series of things that are in the store．You can choose what you need．The supermarket will send the food to your home．
   Companies are making other kinds of "smart" appliances（電器），too．There is a new kind of microwave oven（微波爐） which has a computer memory．It can remember 365 different cookbooks．There is also a smart mixer that can remember cookbooks．Even it can test ingredients for you!
   Of course，sometimes these smart appliances don't work．When they do，they will tell you．And then they can call someone to fix them，too!

（1）Your fridges can do the following things except

．
A．keep food warm
B．make ice
C．keep food cold
D．freeze food
（2）What's the meaning of the underlined word "linked" in Paragraph 2？

A．Prepared．
B．Connected．
C．Offered．
D．Formed．
（3）Which is not true？

A．The oven can call someone to fix itself when it doesn't work．
B．The oven can store 365 cookbooks．
C．The mixer can test ingredients for you．
D．The mixer can help you clean the kitchen．
（4）What is the main idea of the text？

A．Online fridges have a computer screen on the door．
B．Fridges of the future will order food from the supermarket．
C．Smart appliances，like online fridges，can be very helpful．
D．People won't have to go to supermarkets to buy food in the future．
發(fā)布：2024/10/29 0:0:2組卷：67引用：2難度：0.7
解析
3．Everyone knows that fish is good for health．（1）

But it seems that many people don't cook fish at home．Americans eat only about fifteen pounds of fish per person per year，but we eat twice as much fish in restaurants as at home．Buying，storing，and cooking fish isn't difficult．（2）

This text is about how to buy and cook fish in an easy way．
（3）

Fresh fish should smell sweet：you should feel that you're standing at the ocean's edge．Any fishy or strong smell means the fish isn't fresh．（4）

When you have bought a fish and arrive home，you'd better store the fish in the refrigerator if you don't cook it immediately，but fresh fish should be stored in your fridge for only a day or two．Frozen fish isn't as tasty as the fresh one．
There are many common methods used to cook fish．（5）

First，clean it and season it with your choice of spices（調(diào)料）．Put the whole fish on a plate and steam it in a steam pot for 8 to 10 minutes if it weighs about one pound．（A larger one will take more time．）Then，it's ready to serve．

A．Do not buy it．
B．The easiest is to steam it．
C．This is how you can do it．
D．It just requires a little knowledge．
E．The fish will go bad within hours．
F．When buying fish，you should first smell it．
G．The fats in fish are thought to help prevent heart disease．
發(fā)布：2024/10/28 19:30:1組卷：381引用：62難度：0.7
解析

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