题干

近年来,随着经济的快速发展,我市不断加大道路交通基础设施建设,大部分乡镇的道路均提档升级,极大改善了公路交通条件,小张同学和爸爸从某镇开车到天门城区,在经过A处时,车辆上的电子表显示“09:12”,到达B处时,车辆上的电子表显示“09:27”,B处另外还立着一个写有“限速40”的标牌,如图所示,

(1)从A处到B处,小车的平均速度为多少千米每小时?

(2)从B处到天门城区,按交通标牌上的要求行驶,最快还要多长时间可以到达?

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答案(点此获取答案解析)

解:(1)小车从A处到B处所用时间t=09:27﹣09:12=15min=0.25h,
由图可知,从A处到B处的距离s=30km﹣12km=18km,
小车的平均速度:v=
s
t
=

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   Most schools are trying hard to improve their lunch programs and they want to offer the best food they can.
   Even if your school provides healthy options(选择),you may still want to have something delicious outside.How do you take control? Take a packed lunch to school!
   Here are the four reasons to pack your lunch and snacks at least twice a week.Control  Have you ever waited in the lunch line only to find when you get to the front that you don’t like what they’re serving?
   Variety  If you’re eating the same food all the time , your body probably feels ready for a change. Packing lunch a couple of times a week means you can enjoy some favorites that you might not find at every school.
   Money Serving Packing healthy snacks so that you needn’t go out for a fast-food lunch, chocolate or a soda! If so, you will save much money. And you can buy something you need.
   Warm Feeling   Remember when your mom or dad used to pack your lunch? Pack a lunch for yourself, maybe that is your favorite healthy food.
   Whether you pack or eat in the cafeteria(自助食堂),what’s important is that you make right choices. If you are worried that cafeteria doesn’t offer enough healthy choices, try to make changes. Ask a teacher or someone in food service for advice on hoe to get started.
Take a packed lunch to school

 
____  for packing your lunch and snacks twice a week
To control dietsIt helps ____ you eating the unhealthy    food and you needn’t wait in line.
To be ____ Your body needs____ _and you can enjoy some favorites which are not_____ at school
To____ moneyHealthy snacks from home are ____ ____ __than a fast-food lunch.
To feel warmIn the past, your parents packed lunch for you while you just do it____ _now.
ConclusionIt’s important to ____the right food. Go for advice on how to start.