A．whatB．thatC．itD．nothing
A. what
B. that
C. it
D. nothing
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The very special and unusual readers for which the passage is supposed to be written are ______ .
A. school-age children
B. dogs
C. scientists
D. the public
A．presenceB．helpC．absenceD．guide
A. presence
B. help
C. absence
D. guide
A．confirmB．acknowledgeC．confessD．grant
A. confirm
B. acknowledge
C. confess
D. grant
From the passage we can infer that San Francisco is ______ .
A. a place with a diverse population
B. the state economic center
C. a big city with high unemployment
D. a densely populated community
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