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            • 1． — What are you doing?
              — ________________ 

              A. I read a book.
              B. I am reading a book.
              难度：较易
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            • 2． ____________ they ____________ in the forest?  Yes, they are.
              [     ]

              A. Do, watch insects
              B. Are, watching insects
              C. Did, watch insects
              难度：较易
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