题目内容
（请给出正确答案）
For all real numbers p and r, p◇r= pr- p+r.
Column A Column B
(-4)◇5 5◇(-4)
A．if the quantity in Column A is greater
B．if the quantity in Column B is greater
C．if the two quantity are equal
D．if the relationship cannot be determined from the information given
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更多“For all real numbers p and r, …”相关的问题
For all real numbers v, the operation v* is defined by the equation v* = v-(v/3). If (v*)*=8, then v=？
A．15
B．18
C．21
D．24
E．27
Why are three categories on the table missing numbers from last year？
A．Nobody invested in those areas last year.
B．People lost all their money in those investments.
C．Real estate was not divided into two categories last year.
D．The survey did not ask about real estate investments.
CIn hopes of becoming millionaires, many Filipinos (菲律宾人) began drinking more Pepsi. They hoped to get a bottle cap with the winning number on it. In May 1992, the number was announced: 349. Thousands rushed to get their reward with their bottle caps worth a million pesos (about US $ 40,000) each.
But Pepsi wouldn’t pay. The company said there was a mistake. The numbers on the caps did not include a security code (保险号), so the caps were not really winners. Up to 800,000 bottle caps had the number 349.
Pepsi has spent millions of dollars on the problem. The company has paid 54 million pesos to real winners. It also paid 500 pesos for each No. 349 cap without the security code.
第44题：Which of the following is not true？
[A] All those who got the number of 349 got some money.
[B] All those who got the number of 349 didn’t get the same amount of money.
[C] None of those who get the number of 349 wasn’t rewarded.
[D] The company made a mistake so as to sell more Pepsi.
【C1】
A．does
B．makes
C．covers
D．gives
It's actually rather difficult to say which cities【23】the largest. There are two reasons for this difficulty. First of all, it isn't easy to determine a city's boundaries, that is, where a city ends. Nowadays, nearly all cities have a large【24】area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it's difficult to determine what the population of a city is because it's difficult to define what a city is.
The second reason that it is difficult to【25】the population of different cities is this: it is almost impossible to get【26】about the population of all cities for the same year. For example, we might get an estimate of New York's population in 1979 and an【27】of Mexico City's population in 1981. So we real ly can't compare the numbers because the information is for【28】different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.
So we can say that these are our two【29】for comparing the populations of cities: one, it's difficult to determine the【30】of a city, and two, it is difficult to get accurate information.
(46)
A．what
B．which
C．where
D．how
What is the 'biggest city in the world？ That is, (21) city has the largest population？ This seems like (22) question to answer, but actually it isn't.
It's actually rather difficult to say which cities (23) the largest. There are two reasons for this difficulty. First of all, it isn't easy to determine a city's boundaries, that is, where a city ends. Nowadays, nearly all cities have a large (24) area around them. So when we talk about the population of a city, we often mean the population of the whole metropolitan area around the city. That means that it's difficult to determine what the population of a city is because it's difficult to define what a city is.
The second reason that it is difficult to 25 the population of different cities is this: it is almost impossible to get (26) about the population of all cities for the same year. For example, we might get an estimate of New York's population in 1979 and an (27) of Mexico City's population in 1981. So we real ly can't compare the numbers because the information is for (28) different years. And the population of cities changes rather quickly, especially in some cases. For example, the population of Jakarta, Indonesia, may increase by 5% each year, so the population figure will change rather quickly.
So we can say that these are our two (29) for comparing the populations of cities: one, it's difficult to determine the (30) of a city, and two, it is difficult to get accurate information.
21. A. what
B. which
C. where
D. how
For real numbers a, b, and c, is ab=bc+3？
(1) ab=3b
(2) b+3=c
The United States 【B1】 a large part of the North American continent. Its neighbors are Can ada 【B2】 the north, 【B3】 Mexico to the south. 【B4】 the United States is a big country, it’s not the largest in the world. In 1964 its 【B5】 was over 185,000,000.
When this land first became a nation，after 【B6】 independence from England，it had thirteen states, 【B7】 of the states was represented on the American flag by a 【B8】 . All the states were in the eastern part of the continent. As the nation grew towards the west, new states were in the eastern part of the continent. As the nation grew towards the west, new states were added and new stars 【B9】 on the flag. For a long time, there were 48 states. In 1959, however, two 【B10】 stars were added to the flag 【B11】 the new states 【B12】 Alaska and Hawaii.
Sometimes 【B13】 is said that the Indians are the only real Americans. Most Americans,how ever, are descendants (后代）of people 【B14】 came from all over the world to find a new 【B15】 in a new land. 【B16】 who came first and 【B17】 greatest numbers to make their home 【B18】 the eastern coast of North America were mostly from England. It is 【B19】 that reason that the lan guage of the United States is English and that its culture and customs are more like 【B20】 of Eng land than of any other country in the world.
【B1】
A.does
B.makes
C.covers
D.gives
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