题目内容

10．-Tracy，did your whole family go to Paris for sightseeing last year？
-No．____only two of us，my sister and I．（　　）
A．There wasB．It wereC．That wereD．It was

分析 句意：特蕾西，你们全家上周都去巴黎旅游了吗？只有我和我妹妹．

解答 答案：D．
it用于指人，主要用于指代对象不明确的人，或用于确认某人的身份，it做主语时后面的谓语动词一律用单数形式，故选D．

点评 代词的指代有时比较难辨别，需要认真分清所指代的对象，本句可以把它还原成一个完整的强调句型就比较好理解了，即：It was only two of us，my sister and I that went to Paris for sightseeing last year？

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Scientists announced on Thursday, February 11, 2016, at a press conference in Washington, D. C that the more than half-century search for gravitational waves finally succeeded. They confirmed that they had detected gravitational waves caused by two black holes mixing together about 1. 3 billion years ago. It had been the first time the phenomenon was directly detected since it was predicted by Albert Einstein l00 years ago.

A China led space gravitational wave detection project is recruiting (招募) researchers from around the world, china news, com reported. The Tianqin project was started by Sun Yat-sen University in Zhuhhai. It centers on research of key technologies in space gravitational wave detection. To make the project more competitive，global talents in areas such as gravity theory，space gravity experiments and precision measurement are sought with an annual salary of up to 1 million yuan ($ 153.000). according to the report.

Gravitational waves are not easily detectable. When they reach the Earth, an extremely sensitive detector is needed, as other sources of noise can overwhelm the signal. Luo Jun. president of Sun Yat sen University said the detection of gravitational waves is a huge challenge and the project reflects the research competence of China.

The 15-billion yuan project aims to send wave-detection satellites into space in 15 to 20 years with construction of a research center and observatory to be started soon. Researchers will likely cooperate with other scientists from the European Space Agency’s LISA Project.

Gravitational waves are ripples (涟漪) in space time generated during the earliest moment of the universe, when the universe experienced a brief but disordered period of expansion. The detection of gravitational waves is believed to help scientists understand more mysteries of the universe.

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B. They came out about half a century ago.

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C. conduct various space gravity experiments

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Is Online School for You?

Have you ever wished you didn’t have to wake up early and go all the way to school? For 700,000 American kids, this wish comes true. 1. This kind of learning has different names: online learning or distance learning. Regardless of what it is called, this idea may create an impression of a lonely kid reading pages of information on a computer screen rather than from a book or an image of another kid spending the day playing video games instead of learning mathematics or reading a book. Where online education is concerned, both of these are false! Actually, online learning simply means learning differently.

2. Flexibility is the main advantage. Students can attend school wherever and whenever they desire. Homework can be turned in from anywhere the student has Internet access. Additionally, many online schools will allow students to work at their own pace.

Another advantage of online schooling is with the variety of courses. Most online schools teach the same basic classes like English, math, science, and history. 3. However, traditional schools are often unable to offer these types of classes if there are not enough students.

Online schools also have different types of learning tools for kids to use. For example, many online schools have special Websites where only students registered in online classes can watch videos, see lessons presented, or chat with teachers and other students. Some online schools have live class times where students can call and talk with the teacher directly. 4.

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4．The professor could tell by the _____ look in Maria's eyes that she didn't understand a single word of his lecture．（　　）
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