Paragraph 3 mainly tells us that ______ .A．workers now take examinationsB．the population h

Paragraph 3 mainly tells us that ______ .

A．workers now take examinations

B．the population has grown

C．there are only written examinations today

D．examinations are usually written and timed now

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更多“Paragraph 3 mainly tells us th…”相关的问题

第1题

The last paragraph is mainly written to______.A．prove that children aren" t as hard as we

The last paragraph is mainly written to______.

A．prove that children aren" t as hard as we imagine

B．prove that adults can learn a lot from children

C．show that children enjoy playing with adults

D．show that our efforts on children are rewarding

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第2题

The second paragraph is mainly about ______.A．international students solve their money pro

The second paragraph is mainly about ______.

A．international students solve their money problem in different ways

B．international students can't study full time because they have to do spare-time jobs

C．American students prefer to study in their own country

D．American students can attend colleges abroad easily

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第3题

What is Paragraph 3 mainly about？A．The structure of straw houses.B．The possibility of buil

What is Paragraph 3 mainly about？

A．The structure of straw houses.

B．The possibility of building straw houses.

C．The suggestions for building straw houses.

D．The advantages of straw houses.

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第4题

The timing of flu season is a little hard to predict. Part of what makes it unpredictable

is that scientists still don t understand exactly why we have one at all. There have been lots of theories: One theory is that people spend more time indoors, with the windows closed, breathing each other s air. Other scientists have argued that cold of winter weakens our immune systems. A third theory is that the flu virus lives in the cold, dry air, but suffers in the warm, humid air. For a while, scientists had a hard time testing these theories: they needed to run experiments, but researchers aren t allowed to infect humans with illnesses, and most lab animals arent affected by the flu the same way people are. In 2007, a medical researcher named Peter Palese found an 80-year-old journal article that reported that guinea pigs (豚鼠)get infected and pass on the flu just like humans. Palese decided to test Theory 3. The research team led by Palese ran several experiments and in each experiment, they injected half the guinea pigs with influenza A (the common flu), and put them in a box next to a box of uninfected animals. At a temperature of 41 degrees, all four of the exposed guinea pigs caught the flu, but when Palese repeated the experiment at 68 degrees, only one of the animals was infected. And when he ran the test at 86 degrees, none of the exposed animals got sick. The researchers also ran experiments where they varied the humidity in the room but kept the temperature constant: the drier the air, they found, the more animals got sick. Palese s study showed that the influenza virus does spread more effectively in cold, dry air.

What does Paragraph 3 mainly discuss？

A．The direction for future research.

B．The necessity of running more tests.

C．The difficulty of testing the theories.

D．The cost of animal experiments.

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第5题

The first paragraph is mainly about______.A．the value of failureB．how people failC．famous

The first paragraph is mainly about______.

A．the value of failure

B．how people fail

C．famous failures