某市有部分企业经常向河里排放污水。为改变这一状况，我们应该[ ] ①坚持以治理为

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

How can we all get more laughter into our lives? Here is what the experts suggest:

 小题1:Nancy Alguire, a teacher in Clifton Park, N. Y., was once painfully shy and had a hard time laughing. Then she married a circus clown (小丑). “I became interested in the clowns,” she recalls “One day I put on a costume and paint my face. That afternoon my whole life changed. I learned to laugh and enjoy life in a way I had never done before.”  小题2:To this day, she still makes it a rule to be with people who enjoy life and laughing.

 小题3: It doesn’t take you too much time and can be easy. Collect favorite cartoons and jokes. Also, keep a paper for writing down humor you find in everyday life. “Good ideas come and go fast, you have to catch them quickly or they are gone,” says Virginia Tooper.

Laugh when you need it most. “ 小题4: ” says comedian Bill Cosby. “And once you find laughter, no matter how painful your situation might by, you can survive it,” he insists.

Gray Alan, a sociology professor at the University of Minnesota, claims that laughter is a skill we can all gain – because it comes naturally.   小题5:Just remember: we are just here for a period, so get a few laughs.

A．Mix with people who laugh.

B．You can lessen your pain through humor.

C．Practise the art of laughing.

D．But it’s also something that has to be developed.E．He who laughs last laughs best.

F．People’s joy can affect those around them.

G．Keep a laughter file (文档).

化学与人类生活、社会可持续发展密切相关。下列说法正确的是[ ]

A．大量使用农药和化肥，以提高农作物产量

B．用CO₂合成聚碳酸酯可降解塑料，实现“碳”的循环利用

C．天然药物无任何毒副作用，可长期服用

D．为改善食品的色、香、味并防止变质，可加入大量食品添加剂

二尖瓣轻度狭窄，其瓣口面积应为（）

A.>2.5cm ²

B.2.0～2.5cm ²

C.1.5～2.0cm ²

D.1.0～1.5cm ²

E.<1.0cm ²

反补贴的概念及其征收条件是什么？

囊壁内衬柱状细胞，有纤毛，胞质含黏液（）

A．包含囊肿 

B．中肾管囊肿 

C．副中肾管囊肿 

D．前庭大腺囊肿 

E． * * 上皮囊肿