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1£®The system is so abstract that it is hard to know its c________ (ÌØÕ÷).

2£®The number of peacocks is d________ (¼õÉÙ) because of people's activities.

3£®The princess was to b________ (Ôð¹Ö) for the failure of motion.

4£®The earliest ancestors made p________ (ԭʼµÄ) stone tools to hunt animals and take up farming.

5£®The trend spread w________ (±é¼°È«ÊÀ½ç) quickly because it was innovative and popular with young men.

6£®Many wild animals, such as g________ (¾Þ´óµÄ) tortoises and iguanas, are native to this area.

7£®This kind of peacock is native ________ India.