如何确定最适宜的辐射剂量？

2009年12月11日，中国选手刘翔在东亚运动会男子110米栏决赛中，以13秒66的成绩夺得冠军，实现了中国选手在该项目上的三连冠．关于刘翔在决赛中的运动速度，下列说法正确的是（　　）

A．平均速度约为8.05m/s

B．最大速度一定为8.05m/s

C．冲刺速度一定为8.05m/s

D．起动速度约为8.05m/s

面向对象方法是一种运用对象、类、继承、封装、聚合、______、多态性等概念来构造系统的软件开发方法。

阅读理解。

     Walk through the Amazon rainforest today and you will find it is steamy,warm,damp and thick.But if you

had been around 15,000 years ago, during the last ice age, would it have been the same?For more than 30

years, scientists have been arguing about how rainforests like the Amazon might have reacted (反应) to the

cold, dry climates of the ice ages, but until now, no one has reached a satisfying answer.

     Rainforests like the Amazon are important for mopping up CO2 from the atmosphere and helping to slow

global warming. Currently the trees in the Amazon take in around 500 million tonnes of CO2 each year; equal

to the total amount of CO2 giving off in the UK each year. But how will the Amazon react to future climate

change? If it gets drier, will it still survive and continue to draw down CO2? Scientists hope that they will be

able to learn in advance how the rainforest will manage in the future by understanding how rainforests reacted

to climate change in the past.

     Unfortunately,getting into the Amazon rainforest and collecting information are very difficult. To study past

climate, scientists need to look at fossilized pollen,kept in lake muds. Going back to the last ice age means

drilling deep down into lake sediments (沉淀物),which requires specialized equipment and heavy machinery.

There are very few roads and paths,or places to land helicopters and aeroplanes. Rivers tend to be the easiest

way to enter the forest,but this still leaves vast ares between the rivers completely unsampled (未取样). So far,

only a handful of cores have been drilled that go back to the last ice age and none of them provide enough

information to prove how the Amazon rainforest reacts to climate change.

1. The underlined phrase "mopping up" in the second paragraph means _____.

A. cleaning up

B. taking in

C. wiping out

D. giving out

2. How will the Amazon rainforest react to future climate change? 

A. It'll get drier and continue to remove CO2.

B. It'll remain steamy,warm,damp and thick.

C. It'll get warmer and then colder and drier.

D. There is no exact answer up to present.

3. What's the main idea of the last paragraph?

A. It's important to drill deep down into lake sediments to collect information.

B. It's impossible to prove how climate changes in the Amazon rainforest.

C. It's hard to collect information for studies of the past climate in the Amazon rainforest.

D. It's necessary to have specialized equipment and machinery to study the past climate.

4. The best title for this passage may probably be _____.

A. Studies of the Amazon

B. Climates of the Amazon

C. Secrets of the Rainforests

D. Changes of the Rainforests

(二)

某市A乡农户甲于2009年3月1日与乙公司订立合同，出售自己饲养的活鸡1万只，乙公司应在3月21日前支付5万元的首期价款，甲从4月1日起分批交付，交付完毕后乙公司付清余款。3月20日，乙公司得知该市的B乡发现了鸡瘟，即致电向甲询问。甲称，尽管B乡邻近A乡，但是应当不会传播过来。乙公司表示等到事情比较明朗后再付款，甲坚持要求其按时付款，否则将不交货并追究责任。3月25日，因失火导致鸡棚倒塌，致甲所饲养的大部分鸡毁于一旦，甲当即将此事通知了乙。
2009年3月10日，甲向丙公司订购了一批饲料，约定4月10日至20日期间送货上门，甲验收后10日内付款。甲在3月26日把鸡死亡情况通知了丙公司，要求取消交易。丙公司称：货物已经备好，不同意解约，除非甲赔偿其损失。

如果3月25日当地发生地震，甲的鸡全部死亡，则( )。

A．甲可以要求解除合同

B．甲不可以要求解除合同

C．甲应当赔偿丙公司的损失

D．甲不应当赔偿丙公司的损失

患者女，63岁，痰中带血2天，不咳嗽、发热，X线检查如图，最可能的诊断是（）

A．右上肺结核

B．右上肺炎症

C．右上肺不张

D．右上肺癌

E．右上肺错构瘤