Which of the following is NOT true about RV 144？
A. It has been on trial for six years.
B. People who get it are protected against AIDS.
C. People who get it are not as easily infected as others.
D. It is regarded as a very important finding in the history.
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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
【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
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