题目

输入2×（﹣1）+3，输出 ． 答案：【1】1 短文改错。      I took part in a geography research study group in last term. Our topic was environmental pollution and protection. We took the variety of pictures showed the present pollution conditions of our city. Toour surprised, there are still a lot of people doing silly things to our surroundings. Some people throw the rubbish anywhere they like, some cars give off harmful gases, and waste water is poured in rivers by some factories. Worse still, people sometimes had to maketheir ways through dusty winds as a result of pollution. Through our research, we come to know what everybody must pay attention to our environment and some measures should be taken to protect. 1._____2._____3._____4._____5._____6._____7._____8._____9._____10._____