Sally Seaman is an American Writer. She tells young students some smart ways to make friends. In her ____, founding(建立) friendship is just like planting a tree. You should plant the seed(种子) and take care of it to make it grow.

    Firstly, you should choose a friend. A good friend should be kind and patient(有耐心的). For example, if something bad happens to you, a good friend could listen to you. And he or she should ____to help you. 

    ____, you can't be too shy. You should often ____with your friend. You should share your lives with your friend. 

    However, even best friends have fights. What should you do when you ____with your friend? You won't talk to him or her. That's ____. If so, you won't be friends ____. You need to keep on talking to him or her ____. If he or she doesn't want to talk, you can write a letter. That works.

阅读下列图文资料，回答下列问题。

材料一2011年3月11日，日本仙台港以东太平洋附近海域（约北纬38.1°，东经142.6°）发生里氏9.0级特大地震并引发巨大海啸。

材料二  温家宝总理于2011年5月21日至22日出席了在日本东京举行的第四次中日韩领导人会议，三国领导人就中日韩合作和共同关心的地区及国际问题深入交换了意见。

根据短文内容，选择正确答案。

    Tom is a junior high student. He is good at some subjects but his favourite subject is chemistry. Yesterday he met some trouble when he had his chemistry class.

    At that moment, Tom was doing an experiment in class. He tried twenty times, but he couldn't succeed. So he decided to stop doing the experiment. He felt really unhappy.

    His teacher came up to him and asked why he was unhappy. Tom said, "All my work is in vain (白费力气). I fail twenty times and I get nothing."

    Tom's teacher touched Tom's head with a smile. He said to Tom, "Oh, you do a lot and you can get a lot from the mistakes. At least, you know that there are twenty ways you can't use to do this experiment."

    After hearing the teacher's words, Tom became excited. He kept doing the experiment, improved his methods, and he succeeded at last.

使人患扁桃体炎、猩红热、丹毒等多种疾病的营寄生生活的是（ ）

关于种群和群落的叙述，不正确的是（   ）