若函数f(x)=(2b-1)x+b-1，x＞0-x2+(2-b)x，x≤0在R上

用惰性电极电解MnO₄溶液可得到MnO₂,MnO₂的一些性质或用途如右图，下列说法正确的是（   ）

A．实验室用MnO₂与浓盐酸制氯气时，先将MnO₂加热至高温再滴入浓盐酸

B．铝置换二氧化锰中锰的反应为吸热反应

C．用石墨电极电解MnSO₄溶液，在阳极得到MnO₂

D．上述反应中二氧化锰均是氧化剂

相对分子质量为M的某物质在室温下的溶解度为Sg，此时测得饱和溶液的密度为ρg•cm^-3，则该饱和溶液的物质的量浓度是（　　）

A．

M

10Sρ

mol•L-1

B．

1000Sρ

M(100+S)

mol•L-1

C．

10Sρ

M

mol•L-1

D．

M(100+S)

1000Sρmol•L-1

用于阴虚肺热津亏所致咽干声哑的是（）

A．清咽丸

B．利咽解毒颗粒

C．西瓜霜润喉片

D．口腔溃疡散

E．铁笛丸

雅典将伯罗奔尼撒战争经营为一项“产业资金链”解决了财政吃紧的问题。

Holidays are special times of (1) from work and other routines. Holidays are often times for celebration, (2) , eating, drinking, travel, and family (3) . In most cultures the scheduling of holidays originally was related to the (4) , the (5) cycle, and (6) . Christmas, December 25, celebrates the (7) of Jesus, but it is not actually known whether Jesus was (8) in the wintertime Over the years Christmas has come to symbolize goodwill and (9) for both Christians and non-Christians, and the (10) of Christmas threatens to replace generosity with greed. Other important holidays in America are Valentine’s Day, St. Patrick’s Day, April Fools’ Day, and (11) . On Valentine’s Day, people give cards, chocolates, flowers, and kisses to their (12) and sweethearts. During Easter Week in late March or early April, Christians remember the death and (13) of Jesus. Although not actually a holiday and has no religious (14) , April Fools’ Day, celebrated on April 1, is a day when people play embarrassing (15) on their fiends and (16) and even on their teachers. In (17) , Labor Day is celebrated on May 1, whereas in (18) and the United States, labor and laborers are honored by a (19) holiday on the first (20) in September.

Holidays are special times of (1) from work and other routines. Holidays are often times for celebration, (2) , eating, drinking, travel, and family (3) . In most cultures the scheduling of holidays originally was related to the (4) , the (5) cycle, and (6) . Christmas, December 25, celebrates the (7) of Jesus, but it is not actually known whether Jesus was (8) in the wintertime Over the years Christmas has come to symbolize goodwill and (9) for both Christians and non-Christians, and the (10) of Christmas threatens to replace generosity with greed. Other important holidays in America are Valentine’s Day, St. Patrick’s Day, April Fools’ Day, and (11) . On Valentine’s Day, people give cards, chocolates, flowers, and kisses to their (12) and sweethearts. During Easter Week in late March or early April, Christians remember the death and (13) of Jesus. Although not actually a holiday and has no religious (14) , April Fools’ Day, celebrated on April 1, is a day when people play embarrassing (15) on their fiends and (16) and even on their teachers. In (17) , Labor Day is celebrated on May 1, whereas in (18) and the United States, labor and laborers are honored by a (19) holiday on the first (20) in September.