同一纬度的青藏高原和四川盆地的自然景观差异大的因素是[ ]
A．海陆因素
B．临近疆界
C．地形地势
D．地理位置
答案：C
（2014年(春)重庆市高三考前冲刺测试卷）2. For many, winning remains __ dream, but they continue trying their luck as there're always __ chances that they might succeed.
A．/; /
B．a; the
C．a; /
D．the; the
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