问题 选择题

自居易的诗句“几处早莺争暖树,谁家新燕啄春泥”,描述了鸟类的(  )

A.防御行为

B.节律行为

C.繁殖行为

D.社群行为

答案

A、防御行为:为了保护自己,防御敌害的各种行为都是防御行为.如逃跑、装死、释放臭气、保护色、警戒色、集体防御等,不符合题意.

B、节律行为是指生物随着地球、太阳、月亮的周期性变化,逐渐形成的周期性、有节律的行为就是节律行为,如鸟类的迁徙,不符合题意.

C、生殖行为:与动物繁殖有关的行为.如占巢、求偶、交配、孵卵、育雏等一系列行为,诗句中描述了鸟类的筑巢行为,符合题意.

D、社会行为是群体内形成了一定的组织,成员间有明确分工的动物群集行为,有的高等动物还形成等级.社群生活对动物有利,可以有效地猎食和有效地防御捕食者的攻击,使动物群体能更好地适应生活环境,对维持个体与种族的生存有重要的意义,不符合题意.

故选:C

单项选择题
单项选择题

Are you a man or a mouse When people ask this question they want to know (1) you think you are a (2) person or a coward. But you will never really know the answer to this question (3) you are tested in real life. Some people (4) they are brave but when they come face to face with real (5) , they act like cowards. Others think of themselves as cowards, but when they meet danger, they act like (6) .Lenny had always thought of himself as a (7) person. He got worried before examinations. He worried about his job and health. All he wanted in life was to be safe and healthy. (8) , on January 15th, 2002, a plane crashed into the Potomac River in Washington. Lenny went to the river to See what was happening. He saw a woman in the (9) water. Lenny did not feel afraid. He kept very (10) and did a very dangerous thing. He jumped into the Potomac, (11) to the woman, and kept her head (12) the water. Seventy-eight people died that day. Thanks to Lenny, it was not (13) .When you are in a very (14) situation and feel afraid, the body automatically produces a chemical in the blood. The chemical is called adrenalin. (15) adrenalin in the blood system, you actually feel per and per and are (16) to fight or run away. However, when you are absolutely terrified, the body can produce too much adrenalin. Where this (17) , the muscles become very hard and you find you (18) move at all. You are then paralyzed with fear. This is (19) when we are very frightened, we sometimes say we’re "petrified". This word comes from the Greek word "petros", which means "stone". We are (20) frightened that we become stonelike.

第(9)空应选择()

A.fresh

B.poisonous

C.warm

D.ice-cold