①我国还处于社会主义高级阶段    ②社会主义的本质要求

③我国社会的主要矛盾决定的      ④称霸世界的需要

使用显微镜观察细胞，发现视野中的物像不是很清晰，应调节显微镜的（　　）

A．煮沸    B．静置    C．过滤   D．____．

材料分析题：某种昆虫有两种变异类型：一种是有普通翅，能飞；另一种没有翅，不能飞。现将两种类型的一部分放在草丛中，另一部分放在经常刮大风的岛屿上，结果一段时间后，在陆地上的草丛中只剩下有翅膀的昆虫，而在岛屿上只剩下无翅昆虫。

请根据上述材料回答下列问题：

    There is a woman ____（name）Daisy who has devoted all her life to ____（attend）to the homeless children. It's generally recognized that what she has done for children ____（deserve）to be respected by everyone. ____（personal）speaking, her selfless behavior sets a good example to us.

    There was a time when I came across Daisy who ____（invite）to deliver a speech, during which she indicated, “____（take）care of homeless children is just ____ ordinary job, but it doesn't mean that you can look down ____it. Every job is equal. We can't say which one is ____（good ）.” She also said, “Once you set out to do something, you ought to carry on with it to the end, ____ you will gain nothing in the end.”