问题 单项选择题

A、B两人同时从700米长的山坡坡底出发向上跑,跑到坡顶立即返回。他们俩的上坡速度不同,下坡速度则是两人各自上坡速度的2倍。A首先到达坡顶,立即沿原路返回,并且在离坡顶70米处与B相遇。当A到达坡底时,那么B离坡底()米。

A.210

B.240

C.300

D.400

答案

参考答案:C

解析:

A下坡走70米相当于上坡走35米,则A、B上坡的速度之比为(700+35):(700-70)=7:6。

设A上坡速度为7,B上坡速度为6,则A上下坡时间为,B上坡用时,A到达坡底时B下坡所用时间为,路程为米,故所求为700-400=300米。

单项选择题
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Easy Ways to Boost(改善)Your Mood

_______小题1:_______. Taking an extra moment for yourself will make your day brighter and give you a healthier outlook on life. Here are some simple ways you can bring a little happiness into your life right now:

1. Go for a walk.

Grab your dog, best friend, or your significant other and head out on a brisk(轻快的) walk. Just a little bit of exercise can boost your mood and give you a fresh perspective(态度) on problems that have been bothering you. Think walks are boring? ________小题2:_______. Take a trip to the mall, or even walk to get some frozen yogurt. Make it a fun trip and you’ll surely make it part of your routine.

2.________小题3:________.

After all, laughter is the best medicine. Pick up something that makes you laugh like a funny picture, book, magazine, or a DVD of your favorite comedy. _______小题4:______. Giving yourself time to laugh boosts feel-good endorphins(胺多酚).

3. _______小题5:________ .

Take a photo of yourself doing something you enjoy, like roller skating, skiing, swimming, playing an instrument, or being with friends and family.  Place the picture on your desk to remind yourself that you lead an amazing life and have lots to be happy about.

A.Model behavior

B.Try walking to a place that seems exciting to you

C.Ten minutes of relaxation can do wonders

D.Even the most optimistic people can use a mood boost every once in a whileE. Tell someone that you’re guaranteed to brighten their day

F. You could even plan a date night out to a comedy club

G. Buy something silly