多瑙河三角洲的一地点A位于北纬45°东经30°，大兴安岭地区的一地点B位于北纬4
题型：填空题
问题：
多瑙河三角洲的一地点A位于北纬45°东经30°，大兴安岭地区的一地点B位于北纬45°东经120°，设地球的半径为R，则A，B两地之间的球面距离是______．
题型：填空题
If you’re ready to add more physical activity to your life, here are some tips: Make physical activity part of your routine(惯例) like brushing your _____ or going to work. Try biking to work at least once a week, using the _______ more often, or walking to some places near home. But talk to your______ before you start an exercise routine, especially if you haven’t been very active or have _____ problems.  Walking is one of the best fitness activities. To keep up a routine, you can ____ with family members, friends, or pets. Keep track of your steps(步子)______ a step counter( 计算器). You can buy one at a sports ______. This can help you to walk more. If you don’t have time for one 30-minute walk, break it up into ______ 10-minute walks. Find an activity that you enjoy, and stay with it. Change it with other activities so you don’t get______. For example, walk 3 days a week, ______ a softball, volleyball, or basketball club for fun and exercise. By finding more activities you enjoy, you’ll have a greater chance for success.
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