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     A dog is walking along a road. It is a big dog. It is carrying a piece of meat. The piece of meat is in the dog's mouth. The dog is walking across a bridge now.There is water under the bridge. The water is very deep. The dog is looking into the water. It can see a dog in the water. This dog has a piece of meat in its mouth, too. The big dog is barking at the dog in the water. It wants its piece of meat, too. The big dog's piece of meat is falling into the water.

    It's Saturday morning. My parents and I are on a tour bus. There are about twenty people on the bus. Some are from America, and some are from England and Australia. They are all our friends. We are going to the Great Wall. On the bus, there are two Chinese. One is a woman, the other is a man. The woman is good at English. She is talking with us about the Great Wall. The other people are listening to her. They like the Great Wall. They want to see it very much.

从孔子、孟子到荀子，始终贯穿的一条思想主线是（   ）

①诚实守信是现代市场经济正常运行必不可少的条件

②损害国家利益有利于实现企业自身利益的最大化

③国家机关运用经济手段打击企业骗取国家财政补贴的行为

④经济活动参与者要用法律和道德规范自身的行为