[单项选择]To produce artificial noses for practical use, it is essential ______.
A. to develop microchips with thousands of odor receptors
B. to invent chips sensitive to various chemicals
C. to design a computer program to sort out smells
D. to find chemicals that can alter the electrical current passing through

[单项选择]To produce artificial noses for practical use, it is essential______.
A. to develop microchips with thousands of odor receptors
B. to invent chips sensitive to various chemicals
C. to design a computer program to sort out smells
D. to find chemicals that can alter the electrical current passing through

[单项选择]The practical use of radio waves brought about______.


A. new machines for planes
B. a radio directing and ranging device
C. new radio sets for RAF bombers
D. a discovering device

[单项选择]One reason people sometimes rub their noses when they lie is that______
A. they wish they were somewhere else
B. the nose is sensitive to physical changes caused by lying
C. they want to cover their mouths
D. they are trying to stop themselves from telling lies

[单项选择]

Scratchy throats, stuffy noses and body aches all spell misery, but being able to tell if the cause is a cold or flu (流感) may make a difference in how long the misery lasts.
The American Lung Association (ALA) has issued new guidelines on combating colds and the flu, and one of the keys is being able to quickly tell the two apart. That’s because the prescription drugs available for the flu need to be taken soon after the illness sets in. As for colds, the sooner a person starts taking over-the-counter remedy, the sooner relief will come.
The common cold and the flu are both caused by viruses. More than 200 viruses can cause cold symptoms, while the flu is caused by three viruses -- flu A, B and C. There is no cure for either illness, but the flu can be prevented by the flu vaccine (疫苗) , which is, for most people, the best way to fight the flu, according to the ALA.
But if the flu does strike, quick action can help. Although the flu and common cold h
A. shorten the duration of the illness
B. the patient buy medicine over the counter
C. the patient obtain cheaper prescription drugs
D. prevent people from catching colds and the flu

[单项选择]When people lie, they tend to rub their noses in order to ________.
A. stop themselves from lying
B. get rid of itches
C. avoid offensive smell
D. give a hint of lying

[单项选择]And yet here in front of our noses are deep-sea, carbon-based microbes ______ hellish, almost Venus-like conditions.
A. enabling to live in
B. enable us to live in
C. are able to live
D. able to live in

[单项选择]Artificial rainmaking has been most successful in the ______.


A. lake area
B. western slope of mountains
C. prairie lands
D. windward side of mountains

[单项选择]The main difference between natural and artificial selection is that human beings______.


A. control the direction of artificial selection
B. control the direction of natural selection
C. make new genes in artificial selection
D. make new genes in natural selection

[单项选择]The newly developing science of artificial intelligence aims at programming the computer to think, reason and react（）people do.
A. by the same way as
B. in much the same way that
C. with the same way as
D. as much as the same way that

[单项选择]The new trend in artificial intelligence research stems from______.


A. the shift of the focus of study onto the recognition of the shapes of objects
B. the belief that human intelligence cannot be duplicated with logical, step-by-step programs
C. the aspirations of scientists to duplicate the intelligence of a ten-month-old child
D. the efforts made by scientists in the study of the similarities between transistors and brain cells