下图示意某地区人口密度，读图，甲、乙两地都形成了特大城市。与甲地相比，乙地形成城市的区位优势是(　　)

分式$\frac{x^2-9}{x-3}$的值为零时，则x的值为（　　）

回答下列问题：

阅读下面四篇短文，从每题所给的A、B、C、D四个选项中选出最佳选项。

A

     “USA? Britain? Which country is better to study in?” We often hear such discussions. As China opens its door, it is a dream for many Chinese students to study abroad. They want to learn about the outside world.

      It's true that studying abroad can help students develop themselves. Their foreign language skills will be improved and it may be easier to find jobs.

     But there are problems that should be considered. Language is the first. Students must spend a lot of time learning another language.

     Students must also learn to live without parents' care and do with all kinds of things they haven't had to do before, like looking after themselves. There are reports about Chinese students abroad sinking into an ocean of difficulties and giving up finally. When they have to take care of themselves, it is hard for students to study well.

      Finally, studying abroad brings a heavy burden to the family. For most Chinese parents, the cost of studying abroad is very high. But is it worth?

     We know that there are many famous people who succeed in great things through their hard work in China. Liu Xiang is a good example. Once an American teacher invited him there, but he refused. He kept training hard with his Chinese coach. He surprised the world when he won a gold medal at the Athens Olympic Games. So when you wonder which country is better to study in, think again.

词汇运用（共15小题；每小题1分，满分15分）
(A) 根据下列句子及所给汉语注释，写出空缺处各单词的正确形式，每空只写一词。

(B) 在下列各句的空格内填上一个适当的完整的单词，该词的首字母已给出。