在“草→食草昆虫→青蛙→蛇→鹰”食物链中，个体数量最少的动物应该是(    )

若两数的和是负数，则这两个数一定（　　）

根据短文内容，选择正确答案。

    Computers are useful machines. They can help people a lot in their everyday life. For example, they can help people save much time, and they can help people work out many problems they can't do easily. Our country asks everyone to learn to use computers except the old people.

    Today more and more families own computers. Parents buy computers for their children. They hope computers can help them improve their studies in school. Yet many of the children use computers to play games, to watch videos or to sing Karaoke, instead of studying. So many teachers and parents complain (抱怨）that computers cannot help children to study but make them fall behind. So these parents lock computers in the boxes.

In some other countries, even some scientists hate computers. They say computers let millions of people lost their jobs or bring them a lot of trouble.

Will computers really bring trouble to people or can they bring people happiness? In fact, people can decide it by themselves.

关于抗体的产生、特性和作用等的叙述，错误的是（　  ）

材料：100多年前，马克思就指出，世界市场危机必须看作资产阶级经济一切矛盾的现实综合和强制平衡。100多年过去了，资本主义经济仍然需要通过一次次经济危机这种强制平衡来延续，危机的根源即资本主义基本矛盾仍然没有改变，改变的不过是它的表现形式。当新自由主义在全球肆意横行、有人高呼社会主义“历史终结”的时候，嬗变为国际垄断资本的经济范式和政治纲领的新自由主义和凯恩斯主义药方，并没有给世界经济带来繁荣，却带来了全球性的经济动荡，世界贫富分化的矛盾更加尖锐，地区差距、国家差距、民族差距和阶级差距变得更大。