问题 探究题

某探究性学习小组调查了A、B两区的稻田,统计了稻飞虱(水稻的害虫)和青蛙(稻田虱的天敌)的数量变化情况,并绘制成如下曲线图,据图回答有关问题:

(1)在该稻田生态系统中,没有画出的生物成分是____________。

(2)从图中Ⅰ点开始,A区稻飞虱逐渐减少的原因是_____________。

(3)B区使用了杀虫剂甲胺磷后,有部分具有抗药性的稻飞虱存活下来,稻飞虱抗药性的形成是___________的结果。

(4)上述调查表明:生物防治和杀虫剂治虫,哪种效果更好?__________________。

答案

(1)生产者和分解者

(2)稻田生态系统中青蛙数量的增加

(3)自然选择

(4)生物防治

阅读理解

阅读理解。

     The Marches were a happy family. Poverty, hard work, and even the fact that Father March was away

with the Union armies could not down the spirits of Meg, Jo, Beth, Amy, and Merimee, as the March girls

called their mother.

     The March sisters tried to be good but had their share of faults. Pretty Meg was often displeased with

the schoolchildren she taught; boyish Jo was easy to become angry; golden-haired schoolgirl Amy liked to

show up; but Beth, who kept the house, was loving and gentle always.

     The happy days passed and darkness came when a telegram arrived for Mrs. March. "Your husband is

very ill," it said, "come at once." The girls tried to be brave when their mother left for the front. They waited

and prayed. Little Beth got scarlet fever (猩红热) when she was taking care of a sick neighbor. She became

very ill but began to recover by the time Merimee was back. When Father came home from the front and at

that joyful Christmas dinner they were once more all together.

     Three years later the March girls had grown into young womanhood. Meg became Mrs. Brooke, and after

a few family troubles got used to her new state happily. Jo had found pleasure in her literary efforts. Amy

had grown into a young lady with a talent for design and an even greater one for society. But Beth had never

fully regained her health, and her family watched her with love and anxiety.

     Amy was asked to go and stay in Europe with a relative of the Mareches'. Jo went to New York and

became successful in her writing and had the satisfaction of seeing her work published there. But at home

the bitterest blow was yet to fall. Beth had known for some time that she couldn't live much longer to be

with her family, and in the springtime she died.

     News came from Europe that Amy and Laurie, the grandson of a wealthy neighbor, had planned to be

married soon. Now Jo became ever more successful in her writing and got married to Professor Bhaer, and

soon afterwards founded a school for boys.

     And so the little women had grown up and lived happily with their children, enjoying the harvest of love

and goodness that they had devoted all their lives to.

1. The members of the March family were Father March, Mrs., March and their _____.

A. four daughters

B. five daughters

C. son and four daughters

D. son and five daughters

2. Who was the most successful in career (事业) among the March girls?

A. Jo.

B. Beth.

C. Amy.

D. Meg.

3. Which of the following would be the best title for the passage?

A. The March Family.

B. The March Parents.

C. The March Girls.

D. The March Relatives.

4. It can be inferred from the passage that the March family had _____.

A. both happiness and sadness

B. wealthy neighbors

C. more girls than boys

D. a lot of rich relatives

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