A．To explain why farm animals are cloned.

　　B．To discuss why pet cloning is so popular.

　　C．To show cloned animals are very different from each other.

　　D．To prove cloning is not a good way to bring pets from the dead.

　　解析：选D　推理判断题。由第三段中的"but research on cloned cows and pigs ...but there are still differences in personality and appearance"可知，作者提到关于克隆牛和猪的研究是为了说明克隆出来的宠物会与原来那个宠物不一样，因此克隆并不是一个挽回自己原有宠物的好方法。

　　3．What will the couple be likely to find out about their new dogs?

　　A．They'll grow in a very strange way.

　　B．They'll dislike their new environment.

　　C．They'll act differently from Shannon.

　　D．They'll have the same personality as Shannon.

　　解析：选C　细节理解题。由最后一段中的"the new dogs will still behave differently"可知，这对夫妇会发现他们的克隆狗与原来的Shannon在行为举止上并不相同。

　　4．What was Piedrahita's attitude towards the lab's promise of pet cloning?

　　A．He disbelieved it.

　　B．He was worried about it.

　　C．He was cautious about it.

　　D．He showed much interest in it.

　　解析：选A　推理判断题。由最后一段中的"that will not be the case"可知，Piedrahita并不相信这样的承诺。

　　Ⅱ.阅读七选五

　　Four Steps to Begin Your Path to Greatness

　　Feeling stuck is quite common. Many times, we have thoughts and dreams of what we want in life. __1__ Our thinking pattern holds us back from going forward. The good news is that, at any moment in time, we have the ability to start taking action toward creating the life we want. Here are four steps to get started：

　　※Celebrate Your Success.

　　Write down all the successes you've already achieved and all the awesomeness that you have today. __2__ And once you're in that positive routine with your thoughts, it will lead you to make better choices and take better action toward your greatness.

　　※Create Your True Vision.

Many times we live based on others' expectations or we stay stuck in a particular place because it's our safety zone. Own your path. It can be hard to do, but allow yourself to get out of your head (or stop listening to what others want for you) and focus on your heart and what it's telling you.