2. A. but　　　　 B. and　　　　　　 C. if　　　　　　　 D. unless　

1. A. knowing B. wondering　 C. earning　　　　　　 D. hearing　

15. B。“It be + 形+for sb. + to do” 表示对某人来说做某事怎样(简单、困难、重要……)而of sb.表示人的性格或品质，如kind, bad, nice 等。

Many of you are studying English and you may be　 1　 why it is so difficult to learn. It’s actually not too difficult to learn　 2　 you know some　 3　 about the language and culture that it reflects (反映). Perhaps the first thing you need to know about English is that it is made up of several other languages　 4　 French, German, Latin, Greek and AngloSaxon. In addition, there are words　 5　 Spanish in English and many American Indian words and names, even some Chinese and Japanese　 6　 can be found in the English language. This borrowing of words　 7　 other languages is　 8　 of the key reasons　 9　 some of the difficulties that people meet with (遇到)　 10　 they are learning English.

14. B。根据整篇文章的观点就可得知人类才是动物真正的敌人。

13. C。狗叫声通常用barking。

12. A。表示长得和鹿差不多高。

11. C。with引导的介宾短语常常用来表示人或物的外貌特征。

10. D。There be sb./sth.+ doing 为固定搭配。

9. B。besides 表示“除了……还有……”，而except“除……之外”。故选except表示除了动物园其它地方就没有动物了。

8. B。跟上一句表达同样的意思。