【答案】　1.away　2.of　3.to　4.through　5.to　6.all　7.through　8.up　9.up　10.up　11.out　12.for　13.attempt　14.in　15.out　16.than　17.in

　　根据提示补全下列教材原句

　　1．Our eyes and ears send signals all the time，and ________________ interprets these signals and builds up a picture of the outside world.

　　我们的眼睛和耳朵不停地发射信号，大脑翻译出这些信号并构建出外部世界的画面。

　　2．________________________________ between Bird Flu and a killer epidemic in the past，Jim Smith looks through the history of epidemics for clues about what the future might hold.

　　近期的新闻报道将禽流感与过去的致命传染病相提并论时，吉姆·史密斯查了传染病的历史以获悉将来会发生什么的线索。

　　3．Scientists now guess that up to 50% of the area's population died from this epidemic ________ it one of the main causes of the fall of the Roman Empire.

　　现在，科学家们猜测当时那个地区有多达50%的人死于这种传染病，这成为罗马帝国衰落的主要原因之一。

　　4．It struck near the end of the First World War and ____________________.

　　它爆发于一战即将结束之时，使世界各地的许多家庭承受丧亲之痛。

　　【答案】　1.it is our brain that　2.With recent press reports drawing parallels　3.making　4.left families mourning worldwide

　　　阅读P38－P39课文，并从四个选项中选择最佳答案

　　1．Why is it important to look at the spread of diseases through the history?

　　A．Because it can enlarge our knowledge.

　　B．Because many epidemics could be the next global epidemics.

　　C．Because people are curious about the history of epidemics.

D．Because it can help us discover the causes and effects of epidemics，and foresee and prevent them in the future.