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【单选题】
组成胃底腺的细胞主要有（ ）A.
主细胞、壁细胞、颈黏液细胞、杯形细胞和内分泌细胞
B.
主细胞、壁细胞、颈黏液细胞、干细胞和内分泌细胞
C.
主细胞、壁细胞、杯形细胞、干细胞和内分泌细胞
D.
主细胞、壁细胞、内分泌细胞和颈黏液细胞
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【简答题】有毒动植物中毒是( )。
【单选题】E-mail—can't live with it, can't live without it. Con artists and real artists, advertisers and freedom fighters, lovers and sworn enemies-they've all flocked to email as they would to any new medium ...
A.
E-mail brings convenience as well as inconvenience.
B.
E-mail complicates our lives.
C.
E-mail links us to others more closely, but at the same time, it isolates us as well.
D.
E-mail draws crowds of people who can't live with or without it.