- These apples look very beautiful.- They ___...

- These apples look very beautiful.

- They ________. See the price $ 3.99 a pound. Very expensive, aren’t they?

A. should         B. would           C. could            D. might

高三英语单项填空中等难度题查看答案及解析

---These grapes look really beautiful.

----They ______! See the price $3.99 a pound. Very expensive, aren’t they!

A．would            B．could             C．might             D．should

高三英语单项填空中等难度题查看答案及解析

—These grapes look really beautiful．

—They _______! See the price $3．99 a pound．Very expensive, aren’t they!

A．might　　 B．could　　 C．would　　 D．should

高三英语单项填空中等难度题查看答案及解析

—These grapes look really beautiful.

—They _______! See the price $3.99 a pound. Very expensive, aren’t they!

A. might    B. could    C. would D. should

高三英语单项填空中等难度题查看答案及解析

——These grapes look really beautiful．

——They ______！See the price，$3．99 a pound．Very expensive，aren’t they！

A．would    B．could    C．might    D．should

高三英语单项填空中等难度题查看答案及解析

— These grapes look really beautiful.

— They _______! See the price $3.99 a pound. Very expensive, aren’t they!

A. would            B. could          C. might          D. should

高三英语单项填空中等难度题查看答案及解析

－These peaches really juicy.

－They ____ be! Just see the price, $3,99 a pound. Very expensive, aren’t they!

A. would            B. could              C. might              D. should

高三英语单项填空中等难度题查看答案及解析

If you look at the night sky, you’ll often see stars moving very quickly. In fact, they move much more quickly than they should according to their size and the laws of physics.

Scientists do not completely understand why the speed of these stars is so high. But many believe the reason is that much of the universe is made of something called “dark matter”. Groups of stars called galaxies, such as the Milky Way, might even be made up of 90 percent dark matter.

How much something weighs depends on where it is. The same object weighs only half as much on Mars as it does on Earth and almost three times as much on Jupiter. So scientists prefer to talk about the mass (质量) of something rather than how much it weighs, because mass does not change. They can work out the mass of galaxies by measuring the distance between them and the speed they move at.

Recently, Jorge Peñarrubia, a senior academic at Edinburgh University, UK, and his team discovered something interesting: The mass of the Milky Way is only half as much as the mass of another nearby galaxy, Andromeda. This seems strange, and dark matter may explain why.

Finding out more about dark matter could help us understand how the universe began, but this is not easy. Lots of scientists with different types of expert knowledge are working on the problem.

We can’t see dark matter, it’s very difficult to measure and we can’t find out its mass. Unlike stars, dark matter doesn’t produce or reflect light. But we can make a good guess that it is there because of the way things move and the way light bends. Experts now think dark matter may be very different from the matter that we find on Earth. There may also be five times as much dark matter in the universe as ordinary matter.

1.Something that weighs 15kg on Earth weighs about ________ on Mars and ________ on Jupiter.

A. 7.5 kg, 45 kg    B. 30 kg, 45 kg        C. 45 kg, 7.5 kg        D. 5 kg, 30 kg

2.The author mentions the masses of the Milky Way and Andromeda mainly to ________.

A. explain why the same object has a different weight on different stars

B. compare the distance between the Milky Way and Andromeda

C. show that studying dark matter could help to answer some scientific questions

D. support the idea that scientists prefer to talk about mass instead of weight

3.Dark matter is difficult to investigate because ________.

A. it travels at a very fast speed

B. we can’t see where it is or measure its mass

C. it’s hard to measure the light it produces and reflects

D. it is much bigger than ordinary matter in size

4.According to the text, dark matter ________.

A. could accelerate the speed of stars

B. could lessen the mass of objects in galaxies

C. makes up the entire universe and its stars

D. may help us identify the origins of the universe

高三英语阅读理解中等难度题查看答案及解析

Coral reefs(珊 瑚 礁)are not just beautiful to look at，but also very useful．They shelter nearly 25％ of ocean life and provide food for billions of people．However, like many other species，this amazing ecosystem(生态系统)is in danger of dying out!

There are two main reasons for the destruction—the rising carbon dioxide levels caused by global warming as well as human influences like bottom operation．While not much can be done about the former，the loss caused by the latter can be reduced．

Bottom operation involves dropping nets to the ocean bed and then dragging them up when filled with fish．This action damaged the ocean floor，causing the coral branches to separate from the reefs．While that is very discouraging，the good news is that if these branches are found quickly，they can be saved．At present，that work is being performed by volunteer divers. But the method has only limited success because they cannot stay long underwater, nor reach depths of over 200 meters where some of the deep-sea coral grows．

However，this is not the case for Coral bots—the robots that can constantly seek out broken branches．A team of ‘coral bots’，each individually working to simple rules will piece together’ damaged bits of coral, allowing them to regrow. They are programmed to be able to distinguish between other things and the coral．The robots work together in groups，similar to bees．If one coralbot is damaged then the others will still be able to complete the task．

Dr Lea-Anne Henry said：“The project of using coral bots offers us the possibility to restore(修复)the function of reefs．It is in the final stage of testing．Once ready, the researchers hope to build hundreds of them and use them effectively in the waters off Scotland and then hopefully in the oceans across the world．”

1.Which of the following is a cause of the danger that coral reefs are facing?

A．The appearance of new creatures．

B．The seriously polluted sea water．

C．The activities of volunteer divers．

D．Human activities like bottom operation．

2.Compared with volunteer divers，coralbots ______________．

A．can stay longer underwater

B．must work as bees do

C．can distinguish what is coral

D．can never be damaged

3.What does the underlined word“them”in the last paragraph refer to?

A．Coralbots．　　　　　 B．Broken branches．

C．working bees．　　 D．Bits of coral．

4.We can infer from the passage that _______________．

A．bottom operation has affected most underwater creatures

B．broken branches of coral can regrow if saved in time

C．hundreds of the coralbots have worked well in the oceans

D．with the coralbots all damaged coral reefs can be restored

高三英语阅读理解中等难度题查看答案及解析

Coral reefs (珊瑚礁) are not just beautiful to look at, but also very useful. They shelter nearly 25％ of ocean life and provide food for billions of people. However, like many other species, this amazing ecosystem (生态系统) is in danger of dying out!

There are two main reasons for the destruction — the rising carbon dioxide levels caused by global warming as well as human influences like bottom operation. While not much can be done about the former, the loss caused by the latter can be reduced.

Bottom operation involves dropping nets to the ocean bed and then dragging them up when filled with fish. This action damaged the ocean floor, causing the coral branches to separate from the reefs. While that is very discouraging, the good news is that if these branches are found quickly, they can be saved. At present, that work is being performed by volunteer divers. But the method has only limited success because they cannot stay long underwater, nor reach depths of over 200 meters where some of the deep-sea coral grows.

However, this is not the case for Coralbots — the robots that can constantly seek out broken branches. A team of “coralbots”, each individually working to simple rules will piece together damaged bits of coral, allowing them to regrow. They are programmed to be able to distinguish between other things and the coral. The robots work together in groups, similar to bees. If one coral bot is damaged, then the others will still be able to complete the task.

Dr Lea-Anne Henry said: “The project of using coralbots offers us the possibility to restore (修复) the function of reefs. It is in the final stage of testing. Once ready, the researchers hope to build hundreds of them and use them effectively in the waters off Scotland and then hopefully in the oceans across the world.”

1.Which of the following is a cause of the danger that coral reefs are facing?

A.The appearance of new creatures.

B.The seriously polluted sea water.

C.The activities of volunteer divers.

D.Human activities like bottom operation.

2.Compared with volunteer divers, coralbots ________.

A.can stay longer underwater

B.must work as bees do

C.can distinguish what is coral

D.can never be damaged

3.What does the underlined word “them” in the last paragraph refer to?

A.Coralbots. B.Broken branches.

C.Working bees. D.Bits of coral.

4.We can infer from the passage that ________.

A.bottom operation has affected most underwater creatures

B.broken branches of coral can regrow if saved in time

C.hundreds of the coralbots have worked well in the oceans

D.with the coralbots all damaged coral reefs can be restored

高三英语阅读理解中等难度题查看答案及解析