相关习题
 0  28129  28137  28143  28147  28153  28155  28159  28165  28167  28173  28179  28183  28185  28189  28195  28197  28203  28207  28209  28213  28215  28219  28221  28223  28224  28225  28227  28228  28229  28231  28233  28237  28239  28243  28245  28249  28255  28257  28263  28267  28269  28273  28279  28285  28287  28293  28297  28299  28305  28309  28315  28323  151629 

科目: 来源: 题型:

Barbara is easy to recognize as she’s the only of the women who ____ evening dress.

  A.  wear  B.  wears  C.  has worm  D.  have worm

查看答案和解析>>

科目: 来源: 题型:阅读理解

In the long discussion of water on the Moon, a new study contradicts(与……相矛盾)) some recent reports that say the Moon had water at the time of its formation. A group of researchers reported in the journal Science that when the Moon was created, some 4.5 billion years ago, there was not much hydrogen(氢气) on it, and therefore no water.

The researchers surveyed and evaluated this by analyzing chlorine isotopes(氯同位素) found in lunar rock samples from Apollo missions. The range of chlorine isotopes in lunar samples was 25 times that found in samples from Earth.

If the Moon had significant levels of hydrogen, as Earth did, this range would have been far less, said Zachary D Sharp, a scientist in the Department of Earth and Planetary Sciences at the University of new Mexico and the study’s lead authour.

The chlorine would have stuck together with hydrogen, forming compounds like hydrogen chloride, and escaped from the Moon’s surface, he said. The abundance of chlorine indicates a lack of hydrogen and water.

“ The amount of water on the Moon was too low for life to possibly have existed there,” he said.

Most scientists believe the Moon was formed when a large object stuck Earth, breaking off a chunk(a vast piece) that has since orbited Earth.

On Earth, goes one theory, water was released as steam form molten basalts(玄武岩) over time, eventually forming bodies of water.

“An understading of whether the Moon was dry or wet will help us understand how water appeared on Earth,” Dr Sharp said.

A new study indicates that _____ on the moorn.

   A. there is plenty of water              B. water is unlikely to exist

   C. water existed in the past             D. there is a little water now

The author would like to tell us ______ through the sixth paragraph.

  A. why there is no water on the Moon     B. how the Moon was formed 

  C. when the Earth struck the Moon       D. where the Moon orbited

  Which is NOT true according to the passage?

  A. Zachary D. Sharp, a scientist of New Mexico was in charge of the new study.

  B. Chlorine isotopes in lunar samples are 25 time larger than those on the Earth.

  C. The more aboundant chloride, the shorter hydrogen and water.

  D. The new study is benificial to understand how water appeared on Earth.

What can we learn from the passage?

  A. There is enough water on the Earth.

  B. Hydrogen chloride easily escaped from the Moon’s surface.

  C. The Earth had significant levels of hydrogen.

  D. Water on the Earth is directly from molten basalts.

查看答案和解析>>

科目: 来源: 题型:

短文改错(共10小题,每题1分,满分10分)

文中共有10处错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏词符号(∧),并在此符号下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:  1、每处错误及其修改均仅限一词;

2、只允许修改10处,多者(从第11处起)不计分。

Dear Mr. and Mrs. William,

I’ve learned that you are interested in Beijing Opera, so I’ve come to give you two ticket for tomorrow evening’s Beijing Opera at Mei Lanfang Theater. But it’s real a pity that you happened to be out. So I have to leave the tickets with this note. The opera will be put on by some famous actors or actresses. He is well worth watching. By the way, I’ve read the two books you lent me, that are very interested. This week, I am busy review my lessons in order to pass the final exams. I’m afraid of that I can’t go to the Opera together with you.

I hope you will have good time.

Yours,

Li Ming

查看答案和解析>>

科目: 来源: 题型:

Her beauty is    compare.

A. over                B. beyond           C. for           D. with

查看答案和解析>>

科目: 来源: 题型:

Tom sat under a tree chatting with his friends and _____ his teacher, stood up in no time.

  A. seeing      B. seen              C. saw       D. to see

查看答案和解析>>

科目: 来源: 题型:

― Why ______ you stay in the countryside, where it’s not convenient to go shopping?

―But I’ve found it rather valuable for my health.

A. can          B. must             C. may         D. shall

查看答案和解析>>

科目: 来源: 题型:

Does it ever _______ to you that they would be punished for being late?

  A. strike          B. occur           C. happen       D. appear

查看答案和解析>>

科目: 来源: 题型:

Lucy has a great sense of humour and always keepsher colleagues ________ with her stories.

    A. amused           B. amusing          C. to amuse     D. to be amused

查看答案和解析>>

科目: 来源: 题型:阅读理解

Laptop(便携式)computers are popular all over the world. People use them on trains and airplanes, in airports and hotels. These laptop connect people to their work place. In the United States today, laptops also connect students to their classrooms.

  Westlake College in Virginia will start a laptop computer program that allows students to do school work anywhere they want. Within five years, each of the 1,500 students at the college will receive a laptop. The laptops are a part of a $10million computer program at Westlake, a 110-year old college. The students with laptops will also have access to the Internet. In addition, they will be able to use e-mail to "speak" with their tethers, their classmates, and their families. However, the most important part of the laptop program is that students will be able to use computers without going to computer labs. They can work with it at home, in a fast-food restaurant or under the trees-anywhere at all!

  Because of the many changes in computer technology, laptop use in higher education, such as colleges and universities, is workable. As laptops become more powerful, they become more similar to desktop computers. In addition, the portable computers can connect students to not only Internet, but also libraries and other resources. State higher-education officials are studying how laptops can help students. State Officials also are testing laptop programs at other universities, too.

  At Westlake College, more than 60 percent of the staff use the computers. The laptops will allow all teachers to use computers in their lessons. As one Westlake teacher said, "Here we are in the middle of Virginia and we're giving students a window on the world. They can see everything and do everything. "

The main purpose of the laptop program is to give each student a laptop to____.

  A. use for their schoolwork         B. access the Internet

  C. work at home             D. connect them to libraries

Why is the word "speak" in the second paragraph in quotation mark(引号)?

  A. They don't really talk      B. They use the computer language

  C. Laptops have speakers        D. None of the above reasons is correct

Which of the following is true about Westlake College?

  A. All teachers use computers      B. 1,500 students have laptops

  C. It is an old college in America          D. Students there can do everything

A window on the world in the last paragraph means that students can____.

  A. attend lectures on information technology    B. travel around the world

  C. get information from around the world    D. have free laptops

What can we infer(推断)passage?

  A. The program is successful        B. The program is not workable

  C. The program is too expensive         D. We don't know the result yet

查看答案和解析>>

科目: 来源: 题型:

I think your health will soon         if you do regular exercise.

    A.give up  B.take up  C.pick up  D.get up

查看答案和解析>>

同步练习册答案