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The human ear admits only a very limited range of frequencies.A．confessesB．gives offC．forc

The human ear admits only a very limited range of frequencies.

A．confesses

B．gives off

C．forces in

D．lets in

提问人：网友Alexis1412 发布时间：2022-01-06

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第2题

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第4题

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TEXT B

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Sound is audible to human beings only if the frequency falls within a certain range. The human ear is usually not sensitive to frequencies of fewer than 20 vibrations per second, or more than about 20, 000 vibrations per second --- although this range varies among individuals. Anything at a pitch higher than the human ear can hear is termed ultrasonic.

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Who is the author of the novel from which this paragraph is taken？ What is the title of the novel？

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Sound is produced by vibrations of an object and is transmitted by alternate increase and decrease in pressure that radiate outward through a material media of molecules--somewhat like waves spreading out on a pond after a rock has been tossed into it.

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A．the ratio of the air speed of an aircraft to the speed of sound.

B．a machine.

C．a Czech-born Australian physicist.

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Small, pink and very ugly. Hardly the qualities of a star, but they describe the deformed

China is fast applying the latest life-science techniques learned from the West m aggressively pursue genome research. It's establishing its own centers of technical excellence to build a scientific base to compete directly with the United States and Europe. With a plentiful supply of smart young scientists at home and lots of interest abroad biotechnology is on the brink of a boom in China and in the view of foreign scientists, Beijing is playing a clever hand, maximizing the opportunities open to them.

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There remain, however, serious barriers to the development of a strong biotech industry. Among them are a poor domestic legal framework, weak enforcement of intellectual-property rights and loose adherence to international standards. China is a signatory of the International Bio Safety Protocol, which should mean adherence to global standards governing the conduct of field trims. But some observers are skeptical. "The regulations look good, but I haven't met one scientist who believes they are being fully adhered to," says a European science analyst.

If shortcuts are taken, then some of the recent scientific achievements trumpeted in the official press may never make it to market. But no matter how strict lab tests are, other problems lie in wait. For example, there is a number of tasks it would take years to fulfill in the patents office, says one lawyer, leaving innovators with little protection if they take a product to market in China.

The mouse on display is most significant in that ______.

A．it has an ear in the shape of a human ear

B．it is unusually small and ugly as a star

C．it is the focus of. the media at the exhibition

D．it indicates China's progress in biotechnology

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