问题 选择题

到了秋天,柳树落叶,而松树却依然郁郁葱葱,这表明:(   )

A.它们都适应寒冷

B.柳树不适应寒冷

C.松树比柳树更适应寒冷

D.柳树对低温更敏感

答案

答案:A

分析:此题考查的知识点是生物对环境的适应.解答时可以从生物适应环境的表现方面来切入.

解:生物必须适应环境才能生存,如沙漠上的植物必须耐旱才能生存,而需水较多的水莲在很难成活.冬天,柳树的叶子纷纷落下,可以降低蒸腾作用,减少水分的散失;同时还能减少因进行蒸腾作用的热量散失,避免因温度过低而冻伤甚至冻死,因此冬季植物落叶是植物对冬季干燥、寒冷环境的一种适应.松树的叶细如针,叶的气孔较少,而且气孔深陷表皮下,叶的表面还有一层蜡质保护,因此蒸腾作用非常弱,可以减少水分散失和热量散失,适应冬天干燥、寒冷的环境.

故选A.

点评:解答此类题目的关键是理解不同生物适应环境的方式不同.学生容易错选为C.

选择题
阅读理解

While it is impossible to live completely free of stress, it is possible to prevent stress as well as reduce its effect when it can’t be avoided.  小题1:

   小题2:    When you are nervous,angry or upset, try releasing the pressure through exercise or physical activity.Running, walking, playing tennis, and working in your garden are just some of the activities you might try.

●Take care of yourself

   小题3:   If you easily get angry and can’t sleep well enough, or if you’re not eating properly, it will be more likely that you will fall into stressful situations.If stress repeatedly keeps you from sleeping, you should consult a doctor.

●Make time for yourself

Schedule time for both work and entertainment.Don't forget, play can be just as important to your overall well-being as work.   小题4:   Go window-shopping or work on a hobby.Allow yourself at least a half hour each day to do something you enjoy.

   小题5:   

Stress can result from disorganization and a feeling that “there’s so much to do, and not enough time”.Trying to take care of everything at once can be too much for you and as a result, you may not achieve anything.Instead, make a list of everything you have to do, then do one thing at a time, checking off each task as it is completed.Set out to do the most important task first.

A.Do whatever you like and want to do.

B.You should make every effort to eat well and get enough rest.

C.Make a list of things to do.

D.Try physical activity.E.You need a break from your daily routine to just relax and have fun.

F.You could smile to yourself in front of a mirror every day.

G.The following are suggestions for ways to deal with stress.