题目

下列不属于动物行为的是( )A. 动物的爬行和奔跑 B. 动物的游水和飞行C. 变色龙改变体色 D. 动物的生长发育过程 答案：【答案】D【解析】动物行为是生物进行的从外部可察觉到的有适应意义的活动，动物所进行的一系列有利于他们存活和繁殖后代的活动，都是动物行为。动物行为不仅包括身体的运动，还包括静止的姿势、体色的改变或身体标志的显示、发声，以及气味的释放等。杜鹃鸣叫、海豚游泳、狼捕捉鹿，鹿在 Teenagers live very busy lives now and often forget to think about their diets and exercise. In fact, healthy  1  along with regular exercise is the only way to keep fit. During your teenage years, giving your body the energy that it needs is  2  . Teenage  3  need about 2,200 calories（千卡热量）a day while boys need a bit  4  —doctors suggest 2,800 for teenage boys. 50% of your calories should come  5  rice, bread, vegetables and fruit. You  6  need to drink a lot of water, 6 to 8 glasses a day. Drinking enough water will improve your skin and give you healthy hair. Exercise is something that can help you.    7   , it can make you look good, feel good and be healthy. Experts （专家） suggest that teenagers should spend at least 30 minutes exercising, five times a week. When you exercise, your body produces something that makes you feel  8   . It can even help you  9  better at night and let you pay more attention  10  you study! 1．A．drink               B．diet                 C．juice               D．fruit 2．A．important          B．hard                C．difficult           D．comfortable 3．A．boys                 B．girls                C．students          D．workers 4．A．less                  B．fewer              C．more              D．much 5．A．from                B．for                  C．to                   D．into 6．A．but                   B．only                C．hardly             D．also 7．A．As if                 B．Like                C．Such as          D．For example 8．A．interested          B．terrified           C．relaxed            D．worried 9．A．wake                B．sleep               C．move              D．laugh 10．A．because          B．when              C．though            D．but