问题 填空题

东方田鼠不同于家鼠,喜野外环境。2007年6月下旬以来,栖息在洞庭湖区400多万亩湖州地中的约20亿只东方田鼠,随水位上涨部分内迁。它们四处打洞,啃食庄稼,严重威胁沿湖防洪大堤和近800万亩稻田。

(1)生态学家研究发现,东方田鼠种群是在围湖造田期间迁入湖州地的,迁入时期种群数量很少,一个月内随着水稻和芦苇等作物种植面积的不断扩大而迅速增长。为研究东方田鼠种群数量的变化规律,生态学家构建了数学模型,其过程如下表。

①.请填写表中Ⅱ和Ⅲ空白之处的内容。

②.表中Nt=N0·λt成立的前提条件是_________________。

③.假设东方田鼠种群迁入初期为3000只,则30天后该种群的数量(N30)为:N30=________只。(用公式表示,不必计算具体结果)

(2)请从环境容纳量的角度思考,提出两项控制东方田鼠数量的有效措施:_______________________。

答案

(1)①.Ⅱ.数学形式    Ⅲ.跟踪统计东方田鼠的数量

②.湖州地的资源充分、空间充足、缺乏天敌、气侯适宜(答出两点即可,或答种群增长不受东方田鼠种群密度增加的影响)

③.3000×(1.0147)30

(2)退耕还湖(或控制水稻和芦苇种植面积),进行生物防治,适当引入天敌

单项选择题
阅读理解

"Beating is a sign of affection, cursing (骂)is a sign of love."

Many may not expect to hear the words of the old Chinese saying in these modern times—with parents wealthier and better educated than they have ever been-but experts say they still ring true.

Today, it seems, Chinese parents are more likely to send their children to pre-college military academies in the United States in the hope that some tough love will pave the way tosuccess.

"Good education doesn't mean letting your child enjoy privileges, especially our boys," said Song Wenming, an entrepreneur(企业家)in Jinhua, East China's Zhejiang province." They should be raised in tough conditions to know what to fight for in the future."

In August, Song sent his 17-year-old son to Valley Forge Military Academy (VFMA) in Pennsylvania. And he is far from alone, even though it takes a lot of money - around $48,000 per year —to send a child to a strict military school.

Statistics shows that an increasing number of Chinese students have been registering with such academies.

A few years ago, there were no Chinese students at Valley Forge. Today, there are 28."All of the Chinese students at Valley Forge came from wealthy families, some of them were spoiled," said Jennifer Myers, director of marketing and communications at the school.

Song's only son, Song Siyu, had a rocky start during his first six weeks at the school. The teenager said he went to the school voluntarily but did not expect it to be as difficult.

Now, three months later, he has perfected the art of taking a bath in 35 seconds, finishing a meal without looking at his food, and making his bed with precision. He can even take criticism, no matter how unreasonable.

"The training is hard but I know it is good for self-development of individuals," said Song Siyu.'The endless training and scolding are just ways to build up our character, they are not personal."

But his enthusiasm is not universal. Ten of the 13 Chinese students who joined the academy this year have transferred to other schools.

But for those who stick with it, there is a reward for all the hard work.

小题1:From the second paragraph, we can know the old Chinese saying _____.

A.is out of date in modern times.

B.is disagreed by rich parents.

C.is still worth trusting

D.is deeply believed by better educated parent.小题2:The underlined sentence means that _____

A.Song sent his only son to military school, so he feels lonely.

B.Song is the only one who sends his child t to military school.

C.There are other people sending their children to military school besides Song.

D.The fee of the military school is so high that only Song can afford it.小题3:Song Siyu got some achievements in the military school except _____.

A.taking a bath in a short time

B.having his meal with his eyes closed

C.taking unreasonable criticism

D.improving his character小题4:How many Chinese students are there at Valley Forge before this year?

A.10

B.13

C.15

D.25小题5:Which of the following can be inferred from the passage?

A.   It's likely that more and more Chinese students will attend VFMA.

B.    Most Chinese parents approve of educating their children by beating and cursing nowadays.

C.   Song Siyu had no difficulty in adjusting to the life at VFMA.

D.   Most Chinese students support the way of education at VFMA.