肺气肿康复治疗的最主要作用是（） A.提高肺功能 B.改善心理 C.增加肺通气 D.

美国的个人所得税占税收的66%，美国联邦州、县的税务机关每年都对纳税人进行抽查，尽管抽查的比例只有1%，然而一旦被查出有偷税行为，哪怕是数量很少也会被罚得倾家荡产。美国对偷逃个人所得税的严厉处罚表明( )

A．税收的无偿性要求国家必须强制征收

B．美国的税收是供资产阶级享受的税收

C．个人所得税收入是财政收入的主要形式

D．任何纳税人都是被强迫向政府缴税的

制约财政收入规模的根本因素是( )。

A．经济发展水平
B．税率水平
C．纳税人数量
D．居民储蓄水平

American Museum of Natural History is one of the largest natural and historic museums in the world and one of the main natural history research and education centres in the United States, set up in 1869 and located in the west of the Central Park, Manhattan District, New York. It (1) 7 hectares in its total area, (2) classical types of buildings. The (3) of ancient creatures and humanity is (4) the first place of all the museums in the world, (5) the representative samples from South America, Africa, Europe, Asia and Australia were collected, besides those from the (6) country, the United States.

In the museum, there are five kinds of exhibits, including astronomy, mineralogy, human history, and animals in the (7) times and those in modern times. There are thirty-eight exhibition halls with different (8) from 500 to 1,500 square metres. Besides these, there is a Roosevelt Memorial Hall in (9) of President Roosevelt who supported the (10) of the museum, which is also used to have a special exhibition, showing the new important (11) on natural sciences and (12) affairs and social problems, and special topics connected closely with the life of the citizens. Besides this, it is also used for avocation (13) to have all kinds of scientific activities in the laboratories, centres of natural science and centres for citizens. There are more than 10 (14) research departments mainly (15) for collection of samples, research and work of publication.

In the museum, there are (16) and sub-libraries of Aulspond ancient amniote, with about 300 thousand books and magazines (17) natural history, many of (18) are very valuable monographs for the first edition. It has published many expert books and magazines, and a large number of propaganda materials, (19) which are the two magazines, Natural History and Members of Museum that have the biggest (20) of their magazines.

6（）

A.wholesome

B.feasible

C.native

D.weird

苍蝇能传播的疾病有_痢疾、伤寒、肝炎。