American people are highly ____, and therefore may find it difficult　to become deeply involved with others. ( 章节：2 难度：2)_做题室

单项选择题American people are highly ____, and therefore may find it difficult　to become deeply involved with others. ( 章节：2 难度：2): A、moving; B、mobile; C、motional; D、movable

正确答案：B
答案解析：
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