2、(2010·广州模拟)下列说法正确的是(　 )

①CH₃COONa、BaSO₄都是强电解质； ②硬铝、碳素钢都是合金材料；③合成纤维、光导纤维都是有机高分子化合物；④ 0.1 mol·L^-1 NaOH溶液与0.1 mol·L^-1 Ba(OH)₂ 溶液的PH相同；⑤适量CO₂ 分别通入饱和碳酸钠溶液和澄清石灰水中，都会出现浑浊。

　 A．①②④　　　 　　B．①②⑤　　　　 C．②③⑤　　　　 D．③④⑤

[解析]选B。大部分盐都是强电解质；硬铝是含铝、锰、硅等的合金，钢是铁、碳合金；光导纤维的主要成分是二氧化硅，不是有机高分子化合物；0.1 mol·L^-1 NaOH溶液与0.1 mol·L^-1 Ba(OH)₂ 溶液相比，前者的c (OH^-)小，PH小；CO₂ 通入饱和碳酸钠溶液会产生NaHCO₃晶体，少量CO₂ 通入澄清石灰水中产生CaCO₃沉淀。

1、(2010·福州模拟)已知298K时，Mg(OH)₂的溶度积常数K_SP=5.6×10^－12，取适量的MgCl₂溶液，加入一定量的烧碱溶液达到沉淀溶解平衡，测得Ph=13.0,则下列说法不正确的是(　 )

[解析]选C。A项，PH=13的溶液中，c (H⁺)=10^－13mol/L；B项，溶液中 c (OH^-)=10^－1 mol/L，NaOH抑制水的电离，水电离产生的c (OH^-)=10^－13 mol/L；C项，因为向MgCl₂溶液中加NaOH溶液后混合溶液的PH=13，所以所加NaOH溶液PH＞13；D项，溶液中的c (Mg²⁺)=5.6×10^－12÷10^－2=5.6×10^－10 mol/L。

15．broke up

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根据课文内容用适当的词填空，使短文完整。

Nowadays bands 1.________ one after another both in China and in other countries.Then 2.________ do people get to form a band? Usually bands are formed by music lovers 3.________ come together to write and play their own music.First，they may play to 4.________ to earn money to make a living，and at the same time 5.________ their music and improve themselves.

6．________，there was a band called “The Monkees”which wasn’t formed 7.________.It was formed by TV organizers who had 8.________ for four musicians in a newspaper.At first not 9.________ the members in the band could sing well，neither could they create their 10.________ music.They 11.________ on each other while playing music.Both the jokes and music were 12.________ loosely on the band called “The Beatles”．In spite of this，the band soon attracted many people，who supported them 13.________.After a year 14.________，they began to play their own instruments and write their own music.And they became even more popular than “The Beatles” and sold even more records.However，the band 15.________ in 1970，but reunited in the mid­1980s.

答案：e into being　2.how　3.who　4.passers­by　5.practise　6.However　7.this way　8.advertised　9.all　10.own　11.played jokes　12.based　13.fiercely　14.or so

5．The wonderful performances of the folk bands attract many passers­by，making them as happy as the performers.

4．Recently，some folk bands have been formed in the neighborhoods，in which music lovers often meet and play various music or sing pop songs.

3．Music can not only convey thoughts and feelings but also better understanding between people.

2．Appreciating music and singing Karaoke is the most popular form of entertainment.

6．音乐，使人们工作、学习更轻松，对未来更加有信心了。(feel relaxed，be confident about)

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答案：[句子翻译]　1.Today music is becoming more and more popular with people and they attach too　 much importance to it.