材料：长期以来，受“重发展、轻保护，重经济、轻环境”思想的影响，长江的开发建设与生态环境保护缺乏统筹协调，各自为政。甚至为一地之经济发展置整个流域于不顾，没有将“山水林田湖”作为生命共同体，上下游、干支流、左右岸和水陆之间缺乏有机衔接。近几年，长江生态系统警钟不时敲响:；长江水质不断恶化，沿线水污染事件多发，威胁百姓用水安全; 白鳍豚、白鲟多年不见踪迹，长江江豚仅余千头，顶级物种纷纷告急……

为保护好长江母亲河，国务院提出: 推动长江经济带发展，理念要先进，坚持生态优先、绿色发展，把生态环境保护摆上优先地位，涉及长江的一切经济活动都要以不破坏生态环境为前提，共抓大保护，不搞大开发。思路要明确，建立硬约束，长江生态环境只能优化，不能恶化。

运用“发展社会主义市场经济”的知识，联系材料，分析说明国务院在推动长江经济带发展中“共抓大保护，不搞大开发”的原因。

阅读理解

      Hi, everyone! I am Paul Hawking, the trip leader for this weekend' s activity. It’s that time of the year again when the days are long and it is nice to sit outside and enjoy  some oysters(牡蛎).

      We plan to head out to the Mission Bay this Sunday for a beach picnic. You can buy fresh oysters at the Mission Bay Oyster Company and you just need to pay $6 to $l0 for each dozen, depending on the size. It' s on Sunday, June 30.

       We will meet at the Student Center at 9:00 a.m. and all go together. The driving time is one and a half to two hours, and the time of return is still uncertain. Come and join us in what must now be the 4th or 5th such trip for the Outing Club.

       The oyster farm has a small picnic area with chairs and barbecue grills (烧烤架). Bring some briquettes (煤球) if you would like to grill. Except for oysters, oysters and oysters, little is available there, so please bring your own food and drinks. And of course, if you have any special oyster recipes (食谱), bring them make them and share them!

       The weather forecast says it's going to be sunny and around 26°C this weekend. My telephone number is 408-896-3228. Please feel free to call me if you have any questions. Remember to finish your homework before we leave for the picnic.

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