单选题：Many Americans are hesitant to take a vacation because they

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题目类型：单选题
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题目内容：

Many Americans are hesitant to take a vacation because they __________ A．are afraid of losing their jobs
B．enjoy the fast pace of work
C．are devoted to their jobs
D．like the challenges in work

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一辆公共汽车有78个座位，空车发出。第一站上1位乘客，第二站上2位乘客．第三站上3位乘客，以此类推，多少站以后，车上坐满乘客?A．9 B．10 C．11 D．1

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2009年，G省65岁及以上人口数占全国同一年龄阶段人口数的比重约为：A．8．0% B．8．5% C．7．0% D．6．8%

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Of the reptile groups, the snake group was the final one to

Of the reptile groups, the snake group was the final one to appear.A．last B．best

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