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1 . Since these two countries are quite different in the social systems, it is ________ necessary ________ possible for the two sides to change each other.
| A．either; or | B．both; and | C．not; but | D．neither; nor |
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2 . Green is the color that has the ability to reduce pain and relax people both mentally ______ physically. （用适当的词填空）
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