Before the invention of agriculture, what did men do?They went out to ______.
Before the invention of agriculture, what did men do?
They went out to ______.
Before the invention of agriculture, what did men do?
They went out to ______.
Before the invention of refrigeration, the______of fish and meat was a problem.
A.keeping
B.preservation
C.maintenance
D.protection
Before the invention of the Internet, our connections with people took place mainly
A.in person
B.by phone
C.by letter
D.by e-mail
A.treatment
B.maintenance
C.presentation
D.preservation
Which of the following is NOT true?
A.Wheel was man's first and most important invention in history.
B.Wheels are lighter than logs.
C.Wheels were invented before carts.
The passage implies that before the invention of the printing press ______.
A.most people were illiterate
B.people depended for their news on word-of-mouth
C.governments played a less influential role in people's lives
D.the civil and church authorities were virtually the same
Why does the author say that nothing was wasted before the invention of fridges?
A.People would not buy more food than was necessary.
B.Food was delivered to people two or three times a week.
C.Food was sold fresh and did not get rotten easily.
D.People had effective ways to preserve their food.
A、split
B、break
C、destroy
D、tear
According to the passage, the premium system ______.
A.was an American invention
B.appeared before the patent system
C.is as important as the patent system
D.is supported by the federal government
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