---Can you tell me her plan? ---Yes. She is looking forward to ______ A. go sightseeing. B. go sightsee C. goes sightseeing D. going sightseeing. 答案:D
将一张洋葱鳞片叶放在某一浓度的蔗糖溶液中,制成装片,放在显微镜下观察,有3种状态的细胞,如图,你认为这3个细胞在未发生上述情况之前,其细胞液的浓度依次是
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A.A>B>C
B.A<B<C
C.B>A>C
D.B<A<C