三叶草是牛的主要饲料，三叶草传粉受精靠土蜂，土蜂的天敌是田鼠，田鼠不仅喜食土蜂的蜜和幼虫，而且常常捣毁土蜂的蜂巢。土蜂的多少直接影响三叶草的传粉结籽。猫是田鼠的天敌。下列叙述不正确的是（　　）

阅读下列内容, 从每小题所给的 A、B、C、D 四个选项中选择一个最佳答案。

                                                    A

Name: Poodle

   Missing since: June 3, 2015

   Produce: Young(2 years old), curly h air, shy

   Last seen: Wuyi Square

   Please contact (联系): Sarah 839-6722 or sarahcs@hotmail.com

   Please do not run after the dog. It may run in fear.

   Lost and found items(物件) will be displayed(陈列) in the school hall.

   On Friday, June 15, 2015

   During lunch 12:30-1:30

   Parents: If you know that your child has lost something, please remind(提醒) him or her.

   You are also welcome to have a look.

①已经能够直立行走      ②已经能够人工取火

③开始使用磨制石器      ④过着群居生活

按要求完成下列句子。