What is a "progressive tax"？ A "progressive tax" is the tax ______.
A. collected for social progress
B. that increases with each passing year
C. that is collected from those who earn most
D. that varies (变化) according to how much money a person earns
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Do you know the fact that broad bean contains______ that must be destroyed by cooking them
A. flake
B. aroma
C. ether
D. toxin
Most Americans pay ______.
A. taxes which are too many to list
B. taxes either to the cities or the states they live in
C. so many kinds of taxes that they even don't know the names
D. several kinds of taxes
In America, the driver's course mentioned above ______.
A. is considered as part of the advanced education
B. is given to anyone wanting to get a driver's license
C. is carried on at the same time as other courses
D. is offered to all the students of Grade 2 in high schools
The purpose of the writer is ______.
A. to suggest how new type of harbor could be built at sea
B. to give a description of a new type of city
C. to draw people's attention to the problem of air pollution
D. to introduce a new way of building harbor cities
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