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参考答案：对
—Where are we off to?
—We're off-to a place ___ we can see many animals. [ ]
A. that
B. which
C. where
D. what
釉柱的直径平均为
A．4～6微米
B．2～3微米
C．7～9微米
D．0.5～1微米
E．10微米
