Last week, we explained that the planet Mars has passed “opposition. ”It passed a point opposite the Sun. This week, we tell about the planet’s surprising motion(運動)among the stars.

　　　 For thousands of years, people have recognized that planets travel among the stars. The planets generally follow the path taken by the Sun through the sky. The Sun’s path is called the ecliptic. The groups of stars along the ecliptic are called the Zodiac.

　　　 The motion of the planets can be confusing at times. Everyone knows the Sun rises in the east and sets in the west. But this is caused by the turning motion of the Earth. Planets generally move from west to east.

　 However, Mars will appear to move backward for about two months this year. This happens because the Earth is overtaking Mars on its way around the Sun. Mars began its backward, or westward, motion on May 11th, It will start moving eastward again on July 19th.

Mars’ apparent motion has been a mystery to astronomers for hundreds of years. Most early theories of the solar system argued that the Sun and planets turned around the Earth. But the sudden westward motion of Mars presented a problem. Why would Mars move west for two months when it nears “opposition”?

In 1543, a Polish church worker named Nicolas Copernicus published a different theory. His theory said the Earth and planets moved around the Sun in perfectly circular orbits. Copernicus’ theory was simpler. But his Sun – centered system still did not explain the observed motion of Mars very well.

Finally, a German mathematician named Johannes Kepler published a complete theory of the motion of the planets in 1619. He had carefully studied the motion of Mars for many years.

Johannes Kepler discovered that the planets do not move in circular orbits around the sun. Instead, they travel in flattened orbits called ellipses. Mars’ elliptical orbit is the cause of its unusual brightening this year and its apparent large size.

During the next several weeks, you can see for yourself why the mysterious motion of Mars has caused so many people to wonder.

63. From the passage we can learn that 　　　　.

　 A. the sun and planets generally travel westward

B. Kepler studied the orbit of the planets in 1619

　 C. Copernicus’ theory well explained the motion of Mars

　 D. the Earth’s turning motion causes the sun to rise in the east

64. On July 19th Mars 　　　　 .

　 A. will pass the “opposition”　　　　　　　　　　　　 B. appears to change its direction again

　 C. will begin to move westward　　　　　　　　　　 D. appears to change its orbit again

65. Why does Mars appear to be bigger and brighter when it passes “opposition”?

　 A. It is overtaking the earth.　　　　　　　　　　　　　 B. It follows the path of the sun.

　 C. It moves in an elliptical orbit.　　　　　　　　　　 D. It travels in a circular orbit.

66. What is the best title for the passage?

　 A. The Recent Research into Mars 　　　　　　　 B. The Surprising Motion of Mars

C. The Great Discovery on Mars 　　　　　 D. The Wonderful Mystery of Mars

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：2012-2013學(xué)年福建省晉江市養(yǎng)正中學(xué)高一上學(xué)期期中考試英語試卷（帶解析） 題型：單選題

—I did very poorly in last week’s test.
— ____ Look at your paper. You got a good mark.

A．Oh, come off it!B．Absolutely.
C．You’re dead right.D．You’ve got a point there.

查看答案和解析>>

科目：高中英語 來源：2011-2012學(xué)年廣西柳鐵一中高三年級第一次月考英語卷 題型：填空題

此題要求改正所給短文中的錯誤。對標(biāo)有題號的每一行做出判斷：如無錯誤，在該行右邊橫線上畫一個勾（√）；如有錯誤（每行只有一個錯誤），則按下列情況改正：該行多一個詞：把多余的詞用斜線（\）劃掉，在該行右邊橫線上寫出該詞，也用斜線劃掉。該行缺一個詞：在缺詞處加一個漏字符號（∧），在該行右邊橫線上寫出該加的詞。該行錯一個詞：在錯的詞下劃一橫線，在該行右邊橫線上寫出改正后的詞。
注意：原行沒有錯的不要改。

Today Li Lin is praised for how she has done for our class.
【小題1】___________
On a hot afternoon last week Li Lin went to downtown and
【小題2】___________
went from one store to other, looking for the clothes we would
【小題3】____________
wear in the singing contest. She spend the whole afternoon
【小題4】____________
searching until she found it finally. Deeply moved by her
【小題5】____________
efforts, we tried our best and won the first prize in the contest.
【小題6】____________
    Li Lin is always warm-hearted and cares our class a lot.
【小題7】____________
Besides, she often devotes her spare time to help classmates.
【小題8】____________
She has set a good example for us. Therefore, she deserves the
【小題9】____________
praise and we should learn her.
【小題10】____________
 

查看答案和解析>>

科目：高中英語 來源：2012屆河南省許昌新鄉(xiāng)平頂山高三第一次調(diào)研考試英語卷 題型：填空題

假定英語課上老師要求同桌之間交換修改作文，請你修改你同桌寫的以下作文。文中共有10處語言錯誤，每句中最多有兩處，每處錯誤僅涉及一個單詞的增加、刪除或修改。
增加：在缺詞處加一個漏字符號（∧），并在其下面寫出該加的詞。
刪除：把多余的詞用斜線（＼）劃掉。
修改：在錯詞下劃一橫線，并在該詞下面寫出修改后的詞。
注意：1．每處錯誤及其修改均限一詞。
2．只允許修改10處，多者（從第11處起）不計分。
Our English club was set up two months ago．Now，we have members of 25．We met once a week on Saturday afternoon．So far，we have been conducted a variety of activities on English learning，such as watching English films，including a Christmas party and get together with the foreign students．Last week we held an English story－telling competition．We required that the entries would be original and interesting and be presented in English within five minutes．Every member took an actively part in it．Two foreign English teachers were invited to act as judge．At last，LiBing won the first place．Many members said that the activity benefited them many ways．
Not only did it improve their speaking English，but also it brought them more fun．They hope many such activities can be held．

查看答案和解析>>

科目：高中英語 來源：2015屆浙江省高一12月月考英語試卷（解析版） 題型：其他題

動詞填空（每空1分，共10分）

1.My tooth is aching; I’d better have it ________(pull) out.

2.My computer was _______(break) so I couldn’t read your two e-mails until toady.

3. He lay in bed with his eyes closed, __________(listen) to the music over the radio.

4.In yesterday’s physics exam, John got better marks than _________(expect).

5.By the end of last week, four large bridges __________(build) over the river.

6.The question __________(discuss) at the meeting at the moment.

7.According to the timetable, the next train for Beijing ________(leave) at 8: 13.

8. If you want the job_________(do) before Friday, you’d better come to help us.

9. I was about __________(telephone ) him when he entered the room.

10.________(ride) a bike helps you keep slim and stay healthy.

 

查看答案和解析>>

科目：高中英語 來源：2012-2013學(xué)年江西省八校高三聯(lián)考英語試卷（解析版） 題型：閱讀理解

Michelle Obama made a daring decision to return to the same designer who created her Inaugural (就職）Ball dress four years ago --- and the risk paid off.

The First Lady looked extremely attractive in a thin, sweeping, and ruby-colored dress by designer Jason Wu. She teamed the dramatic dress with heels by Jimmy Choo and a diamond ring by Kimberly McDonald.

She surprised the fashion establishment by returning to a Wu design which had been the custom made for her.

Four years ago at her first Inauguration Ball, Michelle shimmered（熠熠生輝）in an off-white, one-shouldered floor-length dress by the designer.

Wu, who was 26 at the time and had only been working in fashion for three years, saw his career take off after the First Lady's surprise decision to wear one of his dresses.

He said at the time that he was unaware she had chosen the dress and had been watching at home on his couch and eating pizza when she appeared.

After her 2013 decision, Wu told Women's Wear Daily: “Mrs Obama likes to keep her secrets. She fooled me again.”

Wu released a women's clothing and accessories（裝飾品）collection at Target last year and continues to be popular with the First Lady for official engagements.

The sleeveless, cross-halter neck dress with low-cut back flattered（突出）49-year-old Michelle's arms and neat waist.

It had been created especially for her by Wu and was a departure from the dark and plain colour tone she stuck to at earlier inauguration events.

Mrs Obama's new hairstyle -- she had bangs（美發(fā)沙龍）cut on her birthday last week  had been loosely tousled（蓬松的）for the special night.

Vice-President Joe Biden's wife Jill also looked attractive in a blue silk dress by Vera Wang at the Inauguration Ball.

1.What does the passage mainly talk about？

A．Michelle Obama’s inaugural ball dress.

B．Wu, a great designer.

C．The First Lady’s secrets.

D．Mrs Obama’s 2013 decision.

2.Michelle Obama’s brave decision proved to be a_________.

A．risk                                  B．danger

C． Surprise                             D．success

3. According to the passage, which of the following is correct?

A．Mrs Obama’s inaugural dresses were made by the same designer.

B．Joe Biden’s wife Jill also had her dress created by Wu.

C．The colour tone at Michelle’s earlier inaugural events was not satifactory.

D．Mrs Obama had straight forehead hair as her new hairstyle for the special night.

4. Which of the following best describes Jason Wu?

A．Daring and gifted.

B．Unusual and cautious.

C．Careful and brave.

D．Talented and lucky.

5. From the 6th and 7th paragraphs we know that________.

A．Wu was aware that Mrs Obama had chosen his work again

B．Wu didn’t know Mrs Obama had chosen his creation again.

C．Mrs Obama told Wu to give away her secrets

D．Mrs Obama should have told Wu the truth

 

查看答案和解析>>

同步練習(xí)冊答案