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The U.S. Food and Drug Administration has acted against similar contamination incidents like that involving SV40 out of fear of a wider spread of AIDS.

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State the changes briefly;2. Give the possible reasons for the changes;3. Predict the trend of changes. Ways 1990s 2000s Staying at home 55% 32% Traveling 16% 30% Doing social investigations 9% 28% Other ways 20% 10%Changes in College Students’ Ways of Spending Summer Vacation
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A．theirB．otherC．hisD．our
A．their
B．other
C．his
D．our
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