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A．It's crowed with tourists.B．No flight goes there.C．The weather is warm.D．It costs mu
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听力原文：M: That's too bad we don't have anyone who can play defense in our team, Madam.
W: You are right, but cheer up! Don't you see we have plenty of players who can shoot three-pointers？
Q: What is their advantage according to the woman？
(17)
A．The canoes can't hold many people.B．The visitors will easily lose their ways.C．The m
听力原文： This week, we talk about getting an American education online. Finding the right online program requires research, just like a traditional education. (33) Talking to advisers and recruiters can help. Keep in mind, though, that they might have a financial interest to direct you to certain programs. Avoid a diploma mill, also known as degree mills, are nothing more than businesses. The education is poor quality, if they even require any class work to get a degree.
The Council on Higher Education Accreditation recognizes a group in Washington to accredit schools that offer distance learning. One hundred and ten programs in the United States and six other countries are accredited by the Distance Education and Training Council. (34) We asked the executive director, Michael Lambert, for advice on choosing a distance learning program. He says the first thing is to go on the CHEA Web site to find if the school is accredited. Next, make sure the school offers what you need. Do you need a degree, or will a certificate or license be enough？ Another consideration is cost. Often the published price does not include all the costs, like books. Technology requirements can also add to the costs. Will you need to get new software or a high-speed Internet connection or even a new computer to take the classes you want？
Also, consider the level of interaction that an online program offers. You might never meet the teacher or other students in person. (35) You need to be able to work without the supervision that you might find in a traditional class.
(30)
Edmund Halley was an English scientist who lived over 200 years ago. He studied the observations of comets (彗星) ,which other scientists had made. The orbit (轨道) of one particular comet was a very difficult mathematical problem. He could not figure it out. Neither could other scientists who dealt with such problems.
However, Halley had a friend named Newton, who was a brilliant mathematician. Newton thought he had already worked out that problem, but he could not find the papers on which he had done it. He told Halley that the orbit of a comet had the shape of an ellipse (椭圆形) .
Now Halley set to work. He figured out the orbits of some of the comets that had been observed by scientists. He made a surprising discovery. The comets that appeared in the years 1531,1607, and 1682 all had the same orbit. Yet their appearances had been 75 to 76 years apart.
This seemed very strange to Halley. Three different comets followed the same orbit. The more Halley thought about it, the more he thought that there had not been three different comets, as people thought. He decided that they had simply seen the same comet three times. The comet had gone away and had come back again.
It was an astonishing idea! Halley felt certain enough to make a prediction of what would happen in the future. He decided that this comet would appear in the year 1758. There were 53 years to go before Halley's prediction could be tested.
In 1758 the comet appeared in the sky. Halley did not see it, for he had died some years before. Ever since then that comet had been called Halley's comet, in his honour.
Edmund Halley figured out the orbit of ______.
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