题目

 Though his parents agreed_____ his views, they didn’t_______ him to go there alone.      A. to; agree          B. with; agree        C. with; allow             D. on; allow 答案：C据统计，2018年全国春节运输人数约为3 000 000 000人，将3 000 000 000用科学记数法表示为（　　）A. 0.3×1010 B. 3×109 C. 30×108 D. 300×107