问题
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The reason why it is difficult to get rid of the threat of global warming is that______.A.
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Why is it difficult to combine television with Internet?A.Because the two media have diffe
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The purpose of the three-year study is to______.A.find out why some children find it diffi
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Why is it so difficult to fall asleep when you are overtired? There is no one answer that【
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Why is it difficult for visitors to locate Cambridge University?A.Because there are no sig
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Why is it difficult to refer to the donor ofDNA?A、Because the woman or women who suppli