We understand _______small changes to our land can have a big impact upon our environment __________ as we know is vulnerable enough.
A．what; whichB．what; whereC．how; whereD．how; which
A
考查固定句式以及定語從句。因為small changes是名詞短語，所以用what引導(dǎo)。第二空是考查定語從句。As we know 是插入語，可以省略，which指代先行詞environment在句中做主語。句意：我們理解，對土地的小小的改變可能會對很脆弱的環(huán)境有很大的影響。
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