食物的美味令人回味无穷，可舌尖上的安全问题也令人心惊肉跳。右边漫画反映了有关商家侵害消费者的（    ）

①依法求偿权   ②公平交易权

③知情权           ④自主选择权

如图，一条河的两岸l₁，l₂互相平行，在一次综合实践活动中，小颖去测量这条河的宽度，先在对岸l₁上选取一个点A，然后在河岸l₂时选择点B，使得AB与河岸垂直，接着沿河岸l₂走到点C处，测得BC=60米，∠BCA=62°，请你帮小颖算出河宽AB（结果精确到1米）．（参考数据：sin62°≈0.88，cos62°≈0.47，tan62°≈1.88）

    There'll be many changes in my school in the future. Students won't____schoolbags to go to school any more. Everyone will have a computer. They will study ____. They will learn all about ____on computers. They will also learn____on computers too. There won't be any school buses in the future. They will ____to school by flying bike.