阅读理解

A

　　 Dolphins (海豚) are not fish but mammals (哺乳动物)．They live in groups, and speak to each other in their own language. In this way they are like many other animals, like bees. But dolphins are very different from almost all land animals. Their brain (脑) is nearly the same size as humans', so they are the cleverest animals. And they live for 20 to 30 years.

        But what does the dolphin look like？The dolphin has teeth, and eats fish. It can grow up to three and a half metres long. Its nose is very long. Like some other animals, the dolphin uses sound to find its way. They make sound to talk to each other and to help find food. We now know they don't use their ears to listen to the sound, but the jaws (颚)．

　　　Dolphins are friendly to people. They often save people in the sea. So many people like them.

奕诉在1861年的一个奏折中说，要抵抗外国的侵略，“探源之策，在于自强”。下列各项，洋务派在“自强”的旗号下创办的军事工业是（    ）

如图所示，电源电压恒定．闭合开关S₁、S₂，电压表示数为9V，电流表示数为1.5A；断开开关S₂，电压表示数为6V．则R₁和R₂的阻值分别是（）

依次填入下列各横线处的词语，恰当的一组是（    ）

①当一个七岁的小孩倒在血泊中时，___________的巴勒斯坦人们向以色列军警投掷大量的石块。

②南陵制药厂推出的这个新药的药方，是综合了几个流传的民间秘方___________而来的。

③四十年后再回此地，他___________的记忆被激活了，许多的人和事又清晰地浮现在脑海中。