世界、发达国家、发展中国家同中国人均预期寿命比较 (单位：岁)
年度	中国				世界	发达国家	发展中国家
	男	女	平均教	男女差值
1950～1955	39.30	42.30	40.76	3.00	45.92	65.74	41.04
1955～1960	43.10	46.20	44.61	3.10	48.96	68.1 9	44.35
1960～1965	48.70	50.40	49.53	1.70	51.46	69.61	47.60
1965～1970	58.80	60.40	59.58	1.60	54.87	70.33	52.06
1970～1975	62.50	63.90	63.18	1.40	56.68	70.92	54.24
1975～1980	65.50	66.20	65.84	0.70	58.11	71.65	55.84
1980～1985	66.69	68.95	67.79	2.26	59.62	72.31	57.61
1985～1990	67.98	70.94	69.42	2.96	61.48	73.43	59.75
1990～1995	69.24	72.64	70.89	3.41	63.04	74.51	61.52
2000～2005	71.44	75.08	73.21	3.64	65.88	76.61	64.59
20lO～2015	73.30	77.10	75.14	3.81	68.08	77.52	67.58
2020～2025	74.85	78.93	76.83	4.08	71.35	78.71	70.42

从哪一时间段开始，我国平均寿命高于世界平均寿命( )

A:1965～1970年 B:1960～1965年 C:1955～1960年 D:1970～1975年

某一国家1890年到1980年人口发展状况表 年份 人口(百万) 10年增加人口(百万) 年份 人口(百万) 10年增加人口(百万) 1890 62.9   1940 131.7 8.9 1900 76.O 13.1 1950 150.7 19.0 1910 92.0 16.0 1960 179.3 28.6 1920 105.7 13.7 1970 203.2 23.9 1930 122.8 17.1 1980 223.9 20.7

在下列哪10年间，该国家人口增长最多（）

A:1950—1960 B:1910—1920 C:1960—1970 D:1970—1980

Central heating became popular only after the Civil War. Typically, coal-burning furnaces (火炉) fueled the early systems. Natural gas had developed into the leading fuel by 1960. Its acceptance resulted in part from its wide uses. Because it comes primarily from U.S. and Canadian fields, natural gas is also less vulnerable (脆弱的) than oil is to War. Oil remains the most important fuel in a few areas, such as New England.
Electric heating dominates most areas with mild winters and cheap electricity, including the South and the Northwest. It was made popular at least in the South by the low cost of adding electric heating to new houses built with air-conditioning. Bottled gas, which is somewhat more expensive than utility gas, is the fuel of choice in rural areas not served by utility pipelines. Wood is the leading heating fuel in just a few rural counties.
Home heating, which accounts for less than 7 percent of all energy consumed in the U.S., has had a commendable (值得赞扬的) efficiency record: from 1978 to 1997, the amount of fuel consumed for this purpose declined 44 percent despite a 33 percent increase in the number of housing units and an increase in house size. The U.S. Department of Energy, however, forecasts that energy used in home heating will rise by 14 percent over the next two decades. That rise is small considering an expected 21 percent increase in the number of houses and the trend toward larger houses.
Natural gas and electricity will probably dominate the home heating market for the next two decades. Solar (太阳的) heating never became popular because of cost and limited winter sunlight in most areas; in 2000 only 47,000 homes relied on it.
Natural gas didn’t become the leading fuel until ______.

A:1978 B:1960 C:1997 D:2000

Home Heating
Central heating became popular only after the Civil War. Typically, coal-burning furnaces (火炉) fueled the early systems. Natural gas had developed into the leading fuel by 1960. Its acceptance resulted in part from its wide uses. Because it comes primarily from U.S. and Canadian fields, natural gas is also less vulnerable (脆弱的) than oil is to war. Oil remains the most important fuel in a few areas, such as New England.
Electric heating dominates most areas with mild winters and cheap electricity, including the South and the Northwest. It was made popular at least in the South by the Iow cost of adding electric heating to new houses built with air-conditioning. Bottled gas, which is somewhat more expensive than utility gas, is the fuel of choice in rural areas not served by utility pipelines. Wood is the leading heating fuel in just a few rural counties.
Home heating, which accounts for less than 7 percent of all energy consumed in the U.S., has had a commendable (值得赞扬的) efficiency record: from 1978 to 1997, the amount of fuel consumed for this purpose declined 44 percent despite a 33 percent increase in the number of housing units and an increase in house size. The U. S. Department of Energy, however, forecasts that energy used in home heating will rise by 14 percent over the next two decades. That rise is small considering an expected 21 percent increase in the number of houses and the trend toward larger houses.
Natural gas and electricity will probably dominate the home heating market for the next two decades. Solar (太阳的) heating never became popular because of cost and limited winter sunlight in most areas; in 2000 only 47, 000 homes relied on it.
Natural gas didn’t become the leading fuel until

A:1978. B:1960. C:1997. D:2000.

第二篇 Home Heating Central heating became popular only after the Civil War. Typically, coal—burning furnaces(火炉)fueled the early systems．Natural gas had developed into the leading fuel by 1960.Its acceptance resulted in part from its wide uses．Because it comes primarily from U．S．and Canadian fields，natural gas is also less vulnerable(脆弱的)than oil is to War．Oil remains the most important fuel in a few areas．such as New England． Electric heating dominates most areas with mild winters and cheap electricity, including the South and the Northwest．It was made popular at least in the South by the low cost of adding electric heating to new houses built with air．conditioning．Bottled gas．which is somewhat more expensive than utility gas，is the fuel of choice in rural areas not served by utility pipelines．Wood is the leading heating fuel in just a few rural counties． Home heating，which accounts for less than 7 percent of a11 energy consumed in the U．S．，has had a commendable(值得赞扬的)efficiency record：from 1978 to 1997，the amount of fuel consumed for this purpose declined 44 percent despite a 33 percent increase in the number of housing units and an increase in house size．The U．S．Department of Energy。however, forecasts mat energy used in home heating will rise by 14 percent over the next two decades．That rise is small considering an expected 2 1 percent increase in the number of houses and the trend toward larger houses． Natural gas and electricity will probably dominate the home heating market for the next two decades．Solar(太阳的)heating never became popular because of cost and limited winter sunlight in most areas；in 2000 only 47.000 homes relied on it． Natural gas didn’t become the leading fuel until

A:1978． B:1960． C:1997． D:2000．

设当前主控索引文件是按“性别”+DTOS(生日期)索引的，索引查找性别为女、出生日期为^1960/07/23的职工，错误操作是______。

A:FIND "女19600723" B:FIND 女+DTOS(^1960/07/23) C:SEEK "女"+DTOS(^1960/07/23) D:先执行OBJ="女"+DTOS(^1960/07/23)，再执行SEEK OBJ

已知当前数据库GZ.DBF中包含出生年月字段为日期型，要求显示1960年以后(包括1960年)出生
人员的记录，使用命令是( )。

A:LIST FOR出生年月>=1960 B:LIST FOR出生年月>=60 C:LIST FOR YEAR(出生年月)>=1960 D:LIST FOR YEAR(出生年月)>=60

已知当前数据库GZ.DBF中包含出生年月字段为日期型，要求显示1960年以后(包括1960年)出生 人员的记录，使用命令是( )。

A:LIST FOR出生年月>=1960 B:LIST FOR出生年月>=60 C:LIST FOR YEAR(出生年月)>=1960 D:LIST FOR YEAR(出生年月)>=60