回答下列有关生物进化和生物多样性的问题。

材料一：某种蛾易被蝙蝠捕食，千百万年之后，此种蛾中的一部分当感受到蝙蝠的超声波时，便会运用复杂的飞行模式，逃脱危险，其身体也发生了一些其他改变。当人工使变化后的蛾与祖先蛾交配后，产出的受精卵不具有生命力。

材料二：蛙是幼体生活于水中，成体可生活于水中或陆地的动物。由于剧烈的地质变化，使某种蛙生活的水体分开，蛙被隔离为两个种群。千百万年之后，这两个种群不能自然交配。

依据以上材料，回答下列问题。

阅读训练

     虎求百兽而食之，得狐，狐曰：“子无敢食我也。天帝使我长百兽；今子食我，是逆①天帝命也。子以我为不信②，吾为子先行；子随我后，观百兽之见我而敢不走乎？”虎以为然，故遂与之行。兽见之皆走。虎不知兽畏己而走也，以为畏狐也。       

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下短文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下画一横线，并在该词下面写出修改后的词。

注意：1). 每处错误及其修改均仅限一词；

2). 只允许修改10处，多者（从第11处起）不计分。

    A city, whether big and small, should be clean. Only when we live in a clean city we live a happy life. As we know, a clean city, that disease may be reduced and people's health may be better, are good both for our mind and body. No one believes people lived in a dirty city with waste everywhere can live happy. However, for more and more people moved into our city, it is not easy to keep our city clean. Beside, some factories will pour waste into the air, the river and onto the ground, making it is hard to keep our city clean. To make our city the better place to live in, we still have a lot to do.

根据句短文理解，完成下列各题。

       A group of people asked this question to a group 4-to-8-year-old children. “What does love mean?” The answers were surprising. The children would answer like they did below.

  “When my grandmother hurt her knees (膝盖), she couldn't bent (弯腰) over and paint her toenails (脚指甲) any more. So my grandfather does it for her all the time, even when his hands hurt too. That's love.”

                                                                                                                                                                   Rebecca–age 8

 “Love is when someone hurts you. And you get so mad but you don't shout at them because you know it would hurt her feelings.”

                                                                                                                                                                  Samantha–age 6

  “Love is what makes you smile when you're tired.”

                                                                                                                                                                  Terri–age 4

 “I let my big sister pick on (捉弄) me because my mum says she only picks on me because she loves me. So I pick on my baby sister because I love her.”

                                                                                                                                                                  Bethany–age 4

  “I know my older sister loves me because she gives me all her old clothes and has to go out and buy new clothes.”

                                                                                                                                                                  Lauren–age 4

   “Love is when Mommy gives Daddy the best piece of chicken.”

                                                                                                                                                                   Elaine–age 5

   “My mommy loves me more than anybody. You don’t see anyone else kissing me to sleep at night.”

                                                                                                                                                                  Clear–age 5

   “You really shouldn't say ‘I love you’ unless you mean it. But if you mean it, you should say it a lot. People forget.”

                                                                                                                                                                  Jessica–age 8