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1 . It is universally _________ (承认,认为) that forests are essential to us. (根据汉语提示单词拼写)
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2 . Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
A.it, it | B.what, what |
C.it, what | D.what, it |
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