5. Washoe could make signs to communicate
6. Some scientists doubted
7. Washoe taught three younger chimps sign language
8. The experimenters thought Washoe was intelligent
A if the Gardeners' argument was sound
B because she was cleverer than other chimps
C when she wanted to eat
D while she was at a research center in Ellensburg
E because she could use sign language to ask for fruits
F while Washoe was learning sign language
答案与题解：
1. C 第一段主要介绍猩猩Washoe的出生地、死亡年龄、被带到美国学习美式手语等一般情况。用General Information about Washoe来概括是很准确的。
2. B 第二段的关键句是In 1969, the Gardners described Washoe's progress in a scientific report.随后的句子简略的介绍了Washoe的学习情况和结果，如已学会了250个单词，并能用手语表达“该吃饭了”等概念。所以，Report about Washoe's Progress in Learning Sign Language(选项B)是答案。
3. E 第三段介绍了对Gardener夫妇发表的报告有两种不同的解读。一派认为Washoe的手语能力只是机械重复、死记硬背、物质激励的结果，不是智能的表现。另一派认为知识智能的表现，其证据是Washoe还能教三个小猩猩学习手语。争论的焦点是猩猩有没有智能。选项E用debate来概括上述争论，所以是答案。
4. A 第四段解释了为什么现在从事这项研究的科学家人数不多。部分原因是研究周期太长。
5. C 选C 的第四段第二句：Washoe made signs to communicate when it was time to eat.
6. A 第三段的上半段说了一些科学家对Gardener 夫妇的试验的解读所持怀疑态度。题干中出现的doubted引导我们选A。
7. D 选D DE 依据是第三段的最后一句,即“He took Washoe to a research center in Ellensburg, Washington. There, Washoe taught sign language to three younger chimpanzees, which are still alive.”
8. E 本文第二段谈到试验的成果时有一个句子：“She could request foods like apples and bananas”。根据全段意思和上述句子，选择E是正确的。
Maglev Trains
1 A few countries are using powerful electromagnets to develop high-speed trains, called maglev trains. Maglev is short for magnetic levitation 1 , which means that these trains float over a guide way using the basic principles of magnets to replace the old steel wheel and track trains.
2 If you've ever played with magnets, you know that opposite poles attract and like poles repel each other2. This is the basic principle behind electromagnetic propulsion. Electromagnets are similar to other magnets in that they attract metal objects, but the magnetic pull is temporary. You can easily create a small electromagnet yourself by connecting the ends of a copper wire to the positive and negative ends of an AA-cell battery3. This creates a small magnetic field. If you disconnect either end of the wire from the battery, the magnetic field is taken away.
3 The magnetic field created in this wire-and-battery experiment is the simple idea behind a maglev train rail system. There are three components to this system: A large electrical power source, metal coils lining a guide way or track, and large guidance magnets attached to the underside of the train.
4 The big difference between a maglev train and a conventional train is that maglev trains do not have an engine -- at least not the kind of engine used to pull typical train cars along steel tracks4. The engine for maglev trains is rather innoticeable. Instead of using fossil fuels, the magnetic field created by the electrified coils in the guideway walls and the track combines to propel the trains5.
5 The magnetized coil running along the track, called a guideway, repels the large magnets on the train's undercarriage, allowing the train to levitate between 1 to 10 cm above the guideway. Once the train is levitated, power is supplied to the coils within the guideway walls to create a unique system of magnetic fields that pull and push~ th train along the guideway. The electric current supplied to the coils in the guideway walls is constantly alternating to change the polarity of the magnetized coils. This change in polarity causes the magnetic field in front of the train to pull the vehicle forward, while the magnetic field behind the train adds more forward thrust.
6 Maglev trains float on a cushion of air', eliminating friction. This lack of friction allows these trains to reach unprecedented ground transportation speeds of more than 500 kph, or twice as fast as the fastest conventional train. At 500 kph, you could travel from Paris to Rome in just over two hours.
责任编辑：wangpeng6151
