— The world is becoming smaller and smaller because of the Internet.
—___________.

如图表示以湿度和温度为变量，描绘出的两个种群能存活和增殖的范围．下列有关叙述正确的是（　　）

    Everyone has his own (自己的) hero. Many students like s ____ stars like C Ronaldo and Li Na. And many students like popular stars. B____ my hero is different. He is one of my c____. We are in the same class. His name is Allan. Allan is not cool. He is s____ and small. But he has a strong mind (内心). He comes f____ Wenchuan, Sichuan Province. And he l____ with his foster parents (养父母).

    Allan is good at all his l____ . He is always No.1 in G____ 7. He plays basketball and football w____ , too. He likes to help others. At home, he helps his foster parents a l____.

    All the teachers and students say Allan is a hero. Do you think so?

写出下列各实验中先要进行的一项：A．____ ，B．____ ，C．____ ．

A．用高锰酸钾制取氧气：①将导管伸入倒置于水槽中的集气瓶；②加热．

B．探究某可燃物的组成，应将其燃烧产物依次通过：①澄清石灰水；②无水硫酸铜．

C．稀释浓硫酸时，烧杯中应依次加入：①水；②浓硫酸．

按要求完成下列句子，每空一词。