题目

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。Before we left, Li Yanping explained to me that the force of gravity would change three times on our journey and【1】the first change would be the most powerful. Then we were off. As the rocket rose into the air, we【2】(pull) back into our seats because we were trying to escape the pull of the earth’s gravity. It was so 【3】(strength) that we could not say anything to each other. Gradually the weight lessened and I was able to talk to【4】(he). “Why is the spaceship not falling back to t读“中国及周边地区略图”，分析回答问题。（1）图中，字母A是_____________（国家），B是_____________（国家），C是_____________（国家）。（2）图中，数字①是_____________（海洋），②是_____________海洋）。图中，甲是_____________（山脉），乙是_____________（山脉）。（3）长江、黄河的发源地所在的省区③是_____________，其行政中心是_____________。（4）图中，北回归线共穿过了_____________个省区，其中位置最东的是