题目

拥有“天蓝、地绿、水净”的美好家园是每个中国人的梦想。①我们需要洁净的空气。大气中的臭氧（O3）能吸收紫外线，与臭氧互为同素异形体的物质是，下列不会增加空气中PM2.5的是（填编号）。A．露天焚烧垃圾 B.治理工地扬尘 C.发展轨道交通，低碳出行②我们需要清洁的能源。目前人们利用最多的能源是煤、和天然气等化石燃料。化石燃料不可再生，氢能作为理想的新能源，重要原因是它的燃烧产物无污染，氢气燃烧的化学方程式为。科学家正选择适当的句子补全下列对话，有两项多余A：Hi，Lucy. 1.B：It was great.I went to the old people's home.A：Really？2.B：I went there with my classmates.A：3.B：Oh，we did lots of things.We helped the old people clean their rooms，played games with them and told them stories.A：Wow！How interesting!B：Yeah，we had lots of fun. 4.A：I didn't go anywhere.B：Why didn't you go out?A：5.B：I see.A．What did you do there?B．What day was it yesterday?C．Because I had to study for the math test.D．How was your weekend?E．How did you go there?F．Where did you go?G．Who did you go with? 1.D 2.G 3.A 4.F 5.C 【解析】 请在此填写整体分析! 1.根据后文回答“It was great”可知提问周末过得怎么样，故选 D 2.根据后文回答“I went there with my classmates.”可知提问和谁去的，故填 G 3.根据后文回答“Oh，we did lots of things.We helpe...