According to the passage, which of the following was an obstacle to the development of the icebox
A. Competition among the owners of refrigerated freight cars.
B. The lack of a network for the distribution of ice.
C. The use of insufficient insulation.
D. Inadequate understanding of physics.
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Surnames are said to be ______ in Anglo-Saxon England.
A. common
B. vocational
C. unusual
D. descriptive
When spring comes, the trees are ______.
A. in a flower
B. in flowers
C. in the flower
D. in flower
Which of the following sentences is an opinion rather than a fact
A. Hundreds of occupational names are at once familiar to us.
B. "Black" and "White" implied "dark" and "fair" respectively.
C. Vocational names carry with them a certain gravity and dignity.
D. Every place in England has given its name to a family.
The Department of the Environment expects the level of industrial air pollution to fall because______.
A. old factories will be replaced by new ones
B. modern power stations will be constructed
C. better controlling methods will be used
D. no emissions will be allowed according to EEC regulations
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