【解析】选A。细节理解题。根据第六段第一句可知缺乏可用的熊猫卵子是一个最主要的问题。

3. Which of the following should be the best title for the passage?

A. China's Success in Cloning Pandas

B. The First Cloned Panda in the World

C. Exploring the Possibility to Clone Pandas

D. China-the Native Place of Pandas Forever

【解析】选C。标题归纳题。本文主要讨论了是否要以及如何克隆熊猫的问题。

4. From the passage we know that________.

A. Kraemer and his team have succeeded in cloning a dog

B. scientists try to implant a panda's egg into a rabbit

C. Kraemer will work with Chinese scientists in clone researches

D. about two thousand of species will probably die out in a century

【解析】选D。推理判断题。根据第三段第一句可知D项正确。

The Intelligent Transport team at Newcastle University have turned an electric car into a mobile laboratory named"DriveLAB"in order to understand the challenges faced by older drivers and to discover where the key stress points are.

Research shows that giving up driving is one of the key reasons for a fall in health and well-being among older people, leading to them becoming more isolated(隔绝)and inactive.

　　Led by Professor Phil Blythe, the Newcastle team are developing in-vehicle technologies for older drivers which they hope could help them to continue driving into later life.

　　These include custom-made navigation(导航)tools, night vision systems and intelligent speed adaptations. Phil Blythe explains: "For many older people, particularly those living alone or in the country, driving is important for preserving their independence, giving them the freedom to get out and about without having to rely on others. "

　　"But we all have to accept that as we get older our reactions slow down and this often results in people avoiding any potentially challenging driving conditions and losing confidence in their driving skills. The result is that people stop driving before they really need to. "

Dr Amy Guo, the leading researcher on the older driver study, explains: "The DriveLAB is helping us to understand what the key stress points and difficulties are for older drivers and how we might use technology to address these problems.

　　"For example, most of us would expect older drivers always go slower than everyone else but surprisingly, we found that in 30mph zones they struggled to keep at a constant speed and so were more likely to break the speed limit and be at risk of getting fined. We're looking at the benefits of systems which control their speed as a way of preventing that.

"We hope that our work will help with technological solutions(解决方案)to ensure that older drivers stay safer behind the wheel. "

【语篇概述】本文是一篇说明文。老年驾驶人员由于种种原因不想驾驶车辆,