某次数学测验共20道选择题,规则是:选对一道得5分,选错一道得-1分,不选得零分,王明同学的卷面成绩是:选对16道题,选错2道题,有2道题未做,他的得分是 .
78分
(分).
_______ visitors come to China every year .[ ]
A. Thousands of
B. Ten thousands
C. Ten thousand of
D. Thousand of
范围经济