更多"The population of Pennsylvania incr"的相关试题:
[单项选择]World population will continue rising from the current 5 billion until about 2050, but if the trends of the 1980s continue, it will ______ at about 9 billion.
A. level up
B. level off
C. level on
D. level down
[单项选择]It took（）years for world population to grow from 1 billion to 3 billion.
A. 100
B. 115
C. 130
D. 145
[单项选择]From a population of 5000 observations, a sample of n=100 is selected. Calculate the standard error of the sample mean if the population standard deviation is 50.（）
A. 4.48.
B. 5.00.
C. 4.00.
[单项选择]From 1970 to 1980 bicycle production increased ______.
A. ten-folds
B. ten folds
C. tenfold
D. ten-fold
[单项选择]From the passage we know that the increased use of cars will ______.
A. consume half of the oil produced in the world
B. have serious consequences for the well being of all nations
C. widen the gap between the developed and developing countries
D. impose an intolerable economic burden on residents of large cities
[单项选择]BI increased
A. enlarged
B. intensified
C. expanded
[单项选择]Which state has the largest population
A. California.
B. Alaska.
C. Los Angeles.
[单项选择]Who sponsored the conference on population
A. The United Nations.
B. Cairo.
C. The World Health Organization.
D. The World Bank.
[单项选择]Scientists assume that unrestrained population growth and dwindling resources may force humans to look to the sea for food.
A. unavoidable
B. unexpected
C. unchecked
D. unfortunate
[单项选择]Unless the population growth stabilizes, environmentalists predict a worldwide starvation by the next decade.
A. famine
B. shortage
C. rebellion
D. infection
[单项选择]（ ）is the population of China
A. How much
B. How many
C. Which
D. What
[单项选择]If the world population is increasing continuously，food supplies will not be ______ to feed them.
A. sufficient
B. efficient
C. equal
D. effective
