_____ life exists on any other planet in the ...

_____ life exists on any other planet in the solar system still remains a question.

A. Why B. Whether C. How D. Where

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It still remains a question _____ life exists on any other planet in the solar system.

A．why              B．whether           C．how              D．where

高一英语单项填空中等难度题查看答案及解析

_____ life exists on any other planet in the solar system still remains a question.

A．Why             B．Whether          C．How              D．Where

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The earth is a special planet in the solar system. The explosion of the earth produced carbon, nitrogen, vapor and other gases, ________1.________ (make) the earth’s atmosphere. What is even more important is _2.________as the earth cooled, water which is fundamental to the________3.________（develop） of life appeared and stayed on the surface. The continued presence of water allowed the earth to dissolve  ________4.(harm) gases into the oceans and this produced a chain reaction which made it possible for life to develop.

Many millions of years later, the _5.________（arrive） of small plants encouraged the development of early shellfish ________6.________ all sorts of fish. Then, with the first green plants appearing on land, land animals appeared and dinosaurs developed and existed on the earth for millions of years. Then Dinosaurs’ sudden disappearance made the rise of mammals possible on the earth. They were different from all life forms ________7.________ ever existed in the past because they produced young from within their bodies. Finally, some small clever animals with hands and legs ___8.___(appear) and spread all over the earth. Thus they, in their turn, have become ________9.________ most important animals. However, they are putting too much carbon dioxide into the atmosphere. So for millions of years to come, ________10.________ life will continue on the earth will depend on whether the present problem can be solved.

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Scientists added a record of 715 more planets to the list known to the world beyond the solar system, astronomers said on Wednesday, in February 2014. The additions include four planets about 0.5-2 times as big as Earth that are the right distance from their parent stars for liquid surface water, which is believed to be fit for life.

The discoveries were made with the NASA’s planet-hunting Kepler space telescope. The telescope, launched in 2009, spent four productive years observing 160,000 target stars for signs of planets passing by, within the telescope’s sight.

The numbers of planets announced at a NASA press conference on Wednesday increased Kepler’s confirmed planets from 246 to 961. Combined with other telescopes’ results, the total number of planets beyond the solar system now is nearly 1,700. “We almost doubled, just today, the number of planets known to humans,” astronomer Douglas Hudgins, head of planet exploration at NASA Headquarters in Washington, told reporters on a conference call.

Many planets’ discovery is due to a new technique that analyzes potential planets in batches rather than one at a time. The method was developed after scientists realized that most planets, like those in the solar system, have similar worlds orbiting a common parent star.

The newly found planets strengthen the evidence that small planets, two to three times the size of Earth, are common throughout the galaxy(银河系).

“Generally, wherever (Kepler) can see them, it finds them,” said astronomer Sara Seager, with the Massachusetts Institute of Technology. “That's why we have confidence that there will be planets like Earth in outer space.”

Like the solar system, which has eight planets plus Pluto and other so-called “dwarf planets,” the newly found planets belong to families. But unlike the solar system’s planets, which are about 150 times farther from the sun than Earth. Most of the planets fly nearer to their parent stars than Venus（金星） orbits the sun, a distance of about 67 million miles (108 million km.)

NASA and other space agencies are designing new telescopes to discover planets in so-called “habitable zones” around their parent stars where temperatures would be suitable for liquid surface water. Two papers on the new Kepler research will appear in an upcoming issue of ‘The Astrophysical Journal’.

1.The underlined word ‘batches’ in the fourth paragraph probably means _____ here.

A. continent　 B. program

C. group　 　　 D. association

2.Through Kepler, Scientists have found more planets ________ throughout the galaxy.

A. the same size as Earth

B. about 0.5—2 times as big as Earth

C. twice the size of Earth

D. two to three times the size of Earth

3.Which of the following statements is TRUE according to the passage?

A. All the planets known to the world are believed to be fit for life.

B. There may be liquid surface water on some of the newly found planets.

C. Kepler space telescope spent four years observing 160,000 target planets.

D. The orbits of the newly found planets are just like those of the solar system

4.Which of the following is the most suitable title for this passage?

A. US space telescope discovers more planets

B. Kepler observes many new target stars

C. Scientists believe 715 planets fit for life

D. NASA finds liquid surface water on the planets

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There might be life on other planets, but so far scientists haven’t found enough _____ to prove it.

A. evidence            B. relic                C. mystery             D. reception

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There might be life on other planets, but so far scientists haven't found enough ________ to prove it.

A．evidence　　      B．relic              C．mystery           D．reception

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Not very long ago, a special family system(体系) existed in certain parts of South India. In the system, the actual head of a family unit was the mother’s eldest brother, though the mother also had an important position in the family. In families of this kind, a husband was actually no more than a visitor. He did not live with his wife, but with his own mother, brothers and sisters in another house. He saw his sons and daughters sometimes, but the man who actually fed and cared for them and acted as their father was their uncle--- their mother’s brother.

But this system, in which brothers and sisters take the place of the father, no longer exists in South India except in a few villages. Economic(经济的) changes have had far- reaching effect on family life. Family life began to change when men went out to work in factories and offices instead of working with their mothers, brothers, and sisters on the land. When a man went out to work, he had money of his own and could buy his own land and build his own family, instead of depending on his mother and his brothers. He wanted to be independent(独立的). This is an example of the way in which economic relations can have an effect on family relationships.

1. The best title of this passage is ______.

2. Who had the actual control of a family in South India not long ago?

3. In this system, the husband lived together with______.

4.Now in South India there are__ of this system in which a husband has no control of his family.

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根据首字母或汉语提示拼写单词

1.In our solar system eight p________ circle around the sun.

2.Do what you are told and don’t a_______ with me.

3.It was in a shop nearby t________ I bought this dress.

4.This kind of fish is r________ in oil, which is good for people who have heart trouble.

5.I would r________ tell him about it myself than let him find out from other people.

6.The train left late that night and arrived in Montreal at ________(黎明) the next

morning.

7.Organic farmers, ________(因此), often prefer using natural waste from animals as

fertilizer.

8.They ________ on (集中精力于) keeping their soil rich and free of disease.

9.Dr. Yuan is quite ________ (满意的) with his life. However, he doesn’t care about being

famous.

10.________ to (由于) his research, the UN has more tools in the battle to rid the world

of hunger.

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Schedules, as the 21st century people know, simply did not exist in the 17th and 18th centuries. We are upset if a plane arrives an hour late. Our ancestors weren’t upset if an April ship didn’t show up until June. They began to worry in July and were often happy when it showed up in August. When a long-distance ship finally did get to the port, the whole city became busy and excited. Businessmen hurried down to check the goods they had ordered. The ship would probably stay in port for at least three days, often a week, to take on businessmen, give the sailors a rest, find out about the latest news, weather conditions, and so on.

Travel time could only be approximate. One never knew when the winds would be good. So even though “average sailing time” was given, time could change considerably, shortening the voyage by up to 25% or putting it off by up to 500% or more! The average run from England to Boston was about a month and a half, but there were also voyages of three months. One voyage in 1640 lasted six months!

Travel time is not the same in both directions, due to the winds and currents. This is especially true in the Caribbean, where winds are from the southeast the entire year. Ships sailing west across the Atlantic spend longer than ships sailing east, and the contrary winds can prevent a ship from actually making it to the harbor even if it gets close. One ship was held off the North Carolina coast for 17 days before being able to land!

1. What can we learn from the first paragraph?

A. No sailor was allowed to have fun when the ship reached land.

B. People in ancient times didn’t care about other people’s safety.

C. The ship would leave for a voyage when all of the preparations were made.

D. A long-distance ship would create a lot of excitement in the place where it landed.

2. According to the passage, travel time can’t be fixed due to ___________ .

A. the people at the port                                B. average sailing time

C. the changeable climate                          D. the businessmen and the sailors

3. The underlined word “currents” in the third paragraph means __________ .

A. the movement of water                         B. the movement of winds

C. direction of the traveling ship         D. travel time of ships

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