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单项选择题

InDarwin’s finches, ____
A、occurrenceof wet and dry years preserves genetic variation for beak size.
B、increasingbeak size over time proves that beak size is inherited.
C、largebeak size is always favoured.
D、Allthe choices are correct.

问答题

宗地图是以（  ）为单位编绘的地籍图。