从源头上解决垃圾问题的办法是(    )。    

阅读理解

NO PLANS FOR THE HOLIDAYS?

Special Story Time for All Lower Primary Pupils

SCHOOL LIBRARY

READING ROOM

June 6,2 p.m. —3 p.m.

Mr.Stephen Keene will impress you with stories from his famous New Kids Next Block series.

FREE ADMISSION

LEARN HOW TO PLAY THE GUITAR IN 4 EASY LESSONS!

Venue: Music Room

Time: 9 a.m. —12 p.m.

Dates: June 6,13,20,27

Instructor: Miss Katsumi from Japan

Fees: $ 40 for 4 lessons *

($ 20 for members of the school band and school choir)

Register with Mrs. Mary Mi , the Choir Mistress, NOW.

*It is compulsory(强制性的) for students who sing up to attend ALL four lessons.

JOIN THE GEOGRAPHY CLUB'S TWILIGHT CRUISE(黄昏巡游)

June 19,5 p.m. —8 p.m.

·View Singapore's wonderful skyline by night.

·Cruise past Kusu Island and Pulau Tekukor (Dove Island)

·Enjoy a great dinner under the starlit sky.

HURRY! VACANCIES(空缺) ONLY FOR THE 1ST 20 PUPILS WHO SING UP.

Get your consent forms(同意书) from Miss Yu and return the forms with your payment($20) by 30 May.

* If there are more than 20 pupils interested in the cruise,priority (优先权) will be given to Geography Club*

我们的祖先很早就掌握了用孔雀石主要成分是Cu₂（OH）₂CO₃和木炭一起加热进行火法炼铜的工艺，早在3000多年前的商朝就造出“后母戊鼎”等许多精美的青铜器．

有关的化学方程式：①Cu₂（OH）₂CO₃2CuO+H₂O+CO₂↑；②C+2CuO2Cu+CO₂↑．

在西汉时期就开始湿法炼铜的应用，当时刘安所著的《淮南万毕术》中，就有曾青（硫酸铜溶液）得铁则化为铜的记载，请回答下列问题：

（1）上述反应①属于分____反应（选填“分解”、“化合”或“置换”）．

（2）青铜属于____（填“氧化物”、“单质”、“化合物”或“混合物”）．

（3）写出湿法炼铜发生反应的化学方程式：____ ．

（4）以“绿色化学”的观点，对照火法炼铜，谈谈湿法炼铜的优点：____．

2010年上海世博会中国馆由国家馆和地区馆两部分组成。这两部分的空间位置与取向．分别体现了东方哲学对“天”“地”关系的理解。国家馆为“天”，富有雕塑感的造型柱——“东方之冠”高耸其间，形成开扬屹立之势；地区馆为“地”，如同基座般形成深厚的依托之态。这表明：
①根据已有的联系建立新具体的联系 
②认识到整体与部分相互制约，关键部分的功能关系整体的成败
③在对立把握统一，在统一中清除对立
④实现肯定与否定的统一，要学会抛弃

已知f（x）=﹣x³+ax，其中a∈R，g（x）=﹣ $\frac{1}{2}$ x ${}^{\frac{3}{2}}$ ，且f（x）＜g（x）在（0，1上恒成立．求实数a的取值范围．