下图是某地地形图，MN、PQ是地形剖面线。①②是水库，若从中选择一个作为自来水厂

歌曲《说唱脸谱》中唱道：“蓝脸的窦尔敦盗御马，红脸的关公战长沙。黄脸的典韦，白脸的曹操，黑脸的张飞叫喳喳。”关于歌中所述的戏曲形式——京剧，下列说法正确的有

①乾隆末年，徽斑进京演出   

②道光年间，形成“徽汉合流”局面

③“同光十三绝”的著名艺人中有梅兰芳等人

④同治、光绪年间，京剧走向成熟

A．②③

B．①②④

C．①②③④

D．①③④

男性，32岁，受凉后出现高热、咳嗽、咳大量脓臭痰2周。查体：右下肺叩诊浊音，可闻及湿性啰音。查：WBC12×10⁹/L，中性分叶粒细胞92%。胸片示：右下叶背段大片阴影并有厚壁空洞。

最重要的进一步检查应为（）

A.肺功能检查

B.支气管舒张试验

C.纤维支气管镜检查

D.痰菌培养及药敏试验

E.痰找瘤细胞

Kofi Annan says helping survivors of last week’’s earthquake and (1)________in the Indian Ocean is (2)________. The United Nations secretary-general says countries that have offered aid must (3)________and provide it. The offers add up to around (4)________dollars. United Nations officials say (5) ________of that is needed during the next six months.The concern about offers of international aid is (6)________. For example, the earthquake in Bam, Iran, in (7)________of 2003 killed more than (8) ________people. Countries and groups offered hundreds of millions of dollars (9) ________. The United Nations says it has (10)________only about (11)________dollars in aid received so far. Governments and organizations that offered help (12) ________that, however.On (13)________Mr. Annan met with world leaders in Jakarta, Indonesia to discuss aid for (14)________. The leaders discussed and (15)________the idea of (16)________owed by affected nations. But the leaders did not say they would do so. Some said that (17)________to survivors would be more helpful.Representatives of (18)________countries and international organizations attended the meeting in Jakarta. Officials say they will cooperate to develop (19)________ for the Indian Ocean and the (20)________.

实验室用加热1-丁醇、溴化钠和浓H₂SO₄的混合物的方法来制备1-溴丁烷时，还会有烯、醚等副产物生成．反应结束后将反应混合物蒸馏，分离得到1-溴丁烷，已知相关有机物的性质如下：

（1）制备1-溴丁烷的装置应选用上图中的______（填序号）．反应加热时的温度不宜超过100℃，理由是______．

（2）制备操作中，加入的浓硫酸必需进行稀释，其目的是______．（填字母）

a．减少副产物烯和醚的生成        b．减少Br₂的生成

c．减少HBr的挥发               d．水是反应的催化剂

（3）反应结束后，将反应混合物中1-溴丁烷分离出来，应选用的装置是______．该操作应控制的温度（t）范围是______．

（4）欲除去溴代烷中的少量杂质Br₂，下列物质中最适合的是______．（填字母）

a．NaI    b．NaOH    c．NaHSO₃    d．KCl．

为防止发动机产生危害较大的爆震现象，所以应使发动机的点火提前角（）。

A、很大，使之远离爆震

B、保持一个固定的点火角

C、保持一个原始的修正提前角

D、跟踪爆震的边缘