7. 下列事實(shí)或變化，能證明一水合氨是弱電解質(zhì)的是(　　 )

A. 氨水受熱分解揮發(fā)出氨氣

B. 氨水與醋酸反應(yīng)生成醋酸銨，而醋酸銨是強(qiáng)電解質(zhì)

C. 氨水的導(dǎo)電能力弱

D. 在氨水溶液中存在NH₃·H₂O分子

6．100ml 1mol·L^-1H₂SO₄中加入下列物質(zhì)后，導(dǎo)電性最差的是　　　　　　 (　　 )　　　　

A.0.2molKOH固體　　　　 B.0.1molBa(OH)₂固體　　　 C.100mlH₂O　　　 D.0.1molFe

5．除去雞蛋白膠體中混有的少量Cl^-的最簡(jiǎn)單方法是　　　　　　　　　 (　 )

A.加入少量硝酸銀溶液　 　B.加熱　　　　 　　　C.電泳　　　 　　　D.滲析

4．下列盛放物質(zhì)的方法：①把汽油放在帶橡皮塞的玻璃試劑中 ②把氫氧化鈉溶液放在帶橡皮塞的試劑瓶中 ③把硝酸放在棕色的玻璃試劑瓶中　 ④把氫氟酸放在無色透明的玻璃試劑瓶中 ⑤把白磷放在水中，其中正確的是　 (　　 )

A．①②③④⑤ B．②③⑤　　 C．①④ D．①②③

3．現(xiàn)有三組溶液：①汽油和氯化鈉溶液　 ②39%的乙醇溶液 �、嗦然�鈉和單質(zhì)溴的水溶液，分離以上各混合液的正確方法依次是　　　　　　　　　　　　　　　　　　 (　　 )

A．分液、萃取、蒸餾　　 B．萃取、蒸餾、分液

C．分液、蒸餾、萃取　　 D．蒸餾、萃取、分液

2．下列說法中正確的是　　　　　　　　　　　　　　　　 (　　 )　

A.非金屬氧化物一定能與堿發(fā)生反應(yīng)

B.金屬氧化物一定不能與堿發(fā)生反應(yīng)

C.酸性氧化物一定能與水反應(yīng)生成酸

D.酸性氧化物可能與酸發(fā)生反應(yīng)

1．將下列各組物質(zhì)按酸、堿、鹽順序排列，正確的是：　　　　　　 　　　　　(　　 )　

A．硫酸、純堿、石灰石　　　　　　　　　 B．醋酸、酒精、醋酸鈉

C．亞硫酸、熟石灰、小蘇打　　　　　　　 D．石炭酸、熟石灰、明礬

根據(jù)教育部通知，從2007年9月1日起，中小學(xué)生每天要跳校園集體舞。通知發(fā)出后，在社會(huì)上引起了熱烈的討論。假如你是李華，請(qǐng)根據(jù)下表提供的內(nèi)容給“China Daily”編輯寫一封信反映討論情況，并提出自己的看法和理由。

注意：(1)字?jǐn)?shù)：150 (2)開頭已給出，不計(jì)入總詞數(shù)。(3)參考詞匯：集體舞：group dancing

社交能力:sociability

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Passage A(Reading)

English is a language with many ____________ rules. Before the middle of the 5th ____________, people in __________ all spoke Celtic. Then three Germanic tribes from the European mainland and the Vikings from the Scandinavian countries invaded Britain. They ________ what we now call Old English. As a result, many pairs of words and phrases have ___________ meanings in English. After the Normans conquered England, French was spoken in this country together with English, which ___________ in even more pairs of similar words.

_________ English included many Latin and Greek words. ___________ also underwent huge changes. It is certain that this _________ will continue, and people will keep ___________ new words and new ways to say things.

2、Passage B(Project)

The Chinese language _________from many Western languages in that it uses _________which have meanings and can stand ________as words. Chinese people invented numerous characters to _________ideas, objects or actions. There is a ________that says that a man named Cang Jie invented Chinese writing. Some characters have been _________and others have been developed from _________into _________forms. The pictograph for a mountain was ________three peaks together. This became one peak and three lines and ___________turned into the character used today.