A recent survey of problems on health______that outdoor exercise______of great importance
A. have shown; are
B. are shown; are
C. has shown; is
D. is shown; is
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【S1】
A. until
B. through
C. in
D. onto
What can be inferred from the passage about AIDS vaccine？
A. In the near future AIDS vaccines will be found.
B. The time is ripe for experts to find AIDS vaccines.
C. AIDS vaccines are difficult, if not impossible, to find.
D. AIDS vaccines failures were due to the trials on animals.
【S14】
A. liberties
B. norms
C. institutions
D. practices
The writer is critical of______.
A. the education system
B. today’s society
C. people with PhDs
D. employers
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