32 Scientists study how photosynthesis works because they want to_____.

A . Right B . Wrong C . Not mention

A . 正确 B . 错误

A．They demanded more specific classification of visits. B．They demanded that church attendance be included as visits. C．They demanded that visiting a friend be classified as intimate. D．They demanded that both men and women be present. 此题为多项选择题。

A．an adaptive B．a mismatched C．a successful D．an obdurate E．a preplanned

Researchers have learned that the slapping noise pigeons make when they suddenly take off is the sound of super charged lift. They call it the "clap fling" effect. Here at SRI International scientists try to duplicate the pigeons' thrust. A flashing strobe reveals the secret. Scott Stanford, a scientist at SRI, says, You re looking at the clap fling effect, where the two wings will come together and peel apart 【C2】______ each other, thus augmenting lift 【C3】______ drawing air from the top to the bottom. " This mechanical bug won't get off the ground. 【C4】______ its flapping wings demonstrate a potential propulsion system for robotic birds: man-made rubbery muscle. Roy Kornbluh works at SRI. "There, I'm turning the voltage on and off, and you can see when the voltage is on, the material is larger 【C5】______ when the voltage is off." Super computers show high-speed airflows over supersonic aircraft. But scientists have only begun to see how air flows 【C6】______ really low speeds. Professor Max Platzer of the Naval Postgraduate School, says, "The flapping wing is generating a thrust, this way, this is the basic physics of the phenomenon." It's pelicans--not pigeons--the Navy is looking at. The Navy is looking at the smooth easy flight of pelicans low over water--called "ground effect." Researchers at the Naval Postgraduate School are trying to imitate the pelican's efficiency. Assistant Professor Kevin Jones of the Naval Postgraduate School says, " 【C7】______ flapping the wings, symmetrically, we're 【C8】______ effect imitating ground effect. We now have the same feature a bird sees when it's flying, over a ground plane." An electric motor drives the flapping wings. Researchers here are working 【C9】______ ways to beam power to the tiny bird. David Jenn of the Naval Postgraduate School says, "There's no battery inside of here, so we're going to set this inside the radar beam, and the energy is extracted from the radar beam and will be used to propel the motor." Scientists are learning it's one thing to build an airplane, 【C10】______ quite another to build a bird. 【C1】______

A.They compared zoo-born elephants with wild elephants. B.They analyzed the records of 800 elephants kept in zoos. C.The zoo-bom elephants they studied were kept in European zoos. D.They kept detailed records of all the elephants in their care.

Certainly Newton considered some theoretical aspects of it in his writings, but he was reluctant to go to sea to further his work. For most people the sea was remote, and with the exception of early intercontinental travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone to ask what lay beneath the surface. The first time that the question "what is at the bottom of the oceans？" Had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed. The engineers had to know the depth profile of the route to estimate the length of cable that had to be manufactured. It was to Maury of the US Navy that the Atlantic Telegraph Company turned, in 1853, for information on this matter. In the 1840s, Maury had been responsible for encouraging voyages during which soundings were taken to investigate the depths of the North Atlantic and Pacific Oceans. Later, some of his findings aroused much popular interest in his book The Physical Geography of the Sea. The cable was laid, but not until 1866 was the connection made permanent and reliable. At the early attempts, the cable failed and when it was taken out for repairs it was found to be covered in living growths, a fact which defied contemporary scientific opinion that there was no life in the deeper parts of the sea. Within a few years oceanography was under way. In 1872 Thomson led a scientific expedition, which lasted four years and brought home thousands of samples from the sea. Their classification and analysis occupied scientists for years and led to a fivevolume report, the last volume being published in 1895. The proposal to lay a telegraph cable from Europe to America made oceanographic studies take on ______. A．an academic aspect B．a military aspect C．a business aspect D．an international aspect

A．They bury measuring device 3 kilometers under the volcano floor. B．They observe carefully the change of the mountain's position. C．They also observe activities of the earth when it changes. D．Devices are placed within 20 kilometers of Mount St．Helens.

A．Honeybees are flying all across the country. B．25-40 percent of the honeybees in the US have died. C．Honeybees are leaving their hives and do not return. D．Honeybee hives are in disorder．

Do you know how to study better and make your study more effective(有效的)？We all know that Chinese students usually study very hard for long().This is very good, but it doesn’t () a lot, for an effective student must have enough sleep, enough food and enough rest and exercise.Every day you need to go out for a walk or visit some friends or some nice places.It’s good for your study. When you return () your studies, your mind will be refreshed(清醒)and you’ll learn more ()study better.Psychologists(心理学家) () that learning takes place this way.Here take English learning () an example.First you make a lot of progress and feel happy.Then your language study seems ()the same.So you will think you’re learning ()and you may give up.This can last for days or even weeks, yet you needn’t give up.At some point your language study will again take another big ().You’ll see that you really have been learning all along.If you get enough sleep, food, rest and exercise, studying English can be very effective and () .Don’t give up along the way.Learn slowly and you’re sure to get a good result. (1)A.days B.time C.hours D.weeks (2)A.help B.give C.make D.take (3)A.after B.for C.at D.to (4)A.yet B.and C.or D.but (5)A.have found B.have taught C.told D.said (6)A.with B.for C.as D.to (7)A.to have B.to make C.to take D.to stay (8)A.something B.anything C.nothing D.everything (9)A.work B.jump C.walk D.result (10)A.hard B.common C.interesting D.possible

A．had studied B．studied C．studies D．has studied

A．pragmatics. B．semantics. C．sociolinguistics. D．psycholinguistics.

A、Fine. What about you？ B、I don’t know. C、Quite right. D、It’s too hard for me.