A．Fire.　　　　　　　 B．Rock.

　　C．Water. D．Clouds.

　　3．It can be known from the passage that ______.

　　A．plants and animals appeared on the earth at the same time

　　B．plants appeared later on the earth than animals

　　C．early shellfish appeared earlier than plants

　　D．animals appeared later on the earth than plants

　　4．How many years did dinosaurs exist on the earth?

　　A．More than 140 billion years.

　　B．More than 140 million years.

　　C．More than 140 thousand years.

　　D．More than 140 years.

　　5．Why can the earth become too hot to live on?

　　A．Small clever animals produce more heat.

　　B．Small clever animals produce too much carbon dioxide.

　　C．Small clever animals don't want heat to escape from the earth.

　　D．Small clever animals like to live on a hot planet.

　　答案：一、1.c　2.a　3.e　4.b　5.d

　　二、A.1.根据；按照　2.变凉　3.与......不同　4.依赖；取决于

　　B．1.in time　2.prevent...from　3.lay eggs　4.give birth to　5.in one's turn

　　三、A-7　B-2　C-8　D-1　E-5　F-9　G-4

　　H-6　I-3　J-10

　　四、1～5 ACDBB

　　1.In our solar system eight planets circle around the sun.

　　在我们的太阳系中，有八颗行星围绕着太阳运转。

　　考点一：the solar system太阳系

　　The solar system is the system of planets，satellites，etc.，of which the sun is the center.

　　太阳系是行星、卫星等的星系，其中太阳是中心。

　　考点二：system n. 系统；体系；制度

　　They are designing a road system.

　　他们在设计一个道路系统。

　　All the workers are prepared to take over the whole system of production.

　　所有的工人准备接管整个生产体系。

　　The present system of education needs improving.

　　目前的教育制度需要改进。

　　归纳：system作"系统；体系；制度"讲时为______名词。

　　单项填空

1)(2011·四川阆中测试)The bank is equipped with a new alarm ______.We can say it's safe and reliable completely.