单选题The market for ethanol fuel in the United States ______.A is known to very few people.B limited due to technological problems.C may expand many times its present size with technological advancement.D is run by the National Ethanol Vehicle Coalition.

题目

单选题

The market for ethanol fuel in the United States ______.

is known to very few people.

limited due to technological problems.

may expand many times its present size with technological advancement.

is run by the National Ethanol Vehicle Coalition.

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相似问题和答案

第1题：

The author seems to be mainly concerned with most fisheries’ ________.

[A] management efficiency

[B] biomass level

[C] catch-size limits

[D] technological application

正确答案：B

第2题：

Population experts tell us that by the year 2025, the population in cities in developing nations will increase to five times its present size.()

参考答案：错误

第3题：

Weather has a great influence(影响) on people．It influences people's health, intelligence (智力) and feelings．

In August, it is very hot and wet in the southern part of the United States．People there have heart disease and other kinds of health problems during this month． In the Northeast and Middle West, it is very hot at some times and very cold at other times．People in these places may have heart disease after the weather changes in February or March．

The weather can also influence intelligence． For example, in a 1982 study by scientists, the in scores of a group of students were very high during a storm, but after the storm their IQ scores were lower than usual level． So storms can increase intelligence．However, very hot weather can lower it． Students in the United States often do badly on exams in the hot months of the year．

Weather also has a strong influence on people's feelings．Winter may be a bad time for thin people．They usually feel cold during these months and they may feel unhappy during cold weather． In hot summer weather, on the other hand, fat people may feel unhappy． The sum- mer heat may make them tired and they are easy to get angry．

( )21．lf thin people feel unhappy, the weather may be very _________．

A．warm

B． cold

C． cool

D． hot

正确答案：B
．21.B【解析】由第四段二、三句可知。

第4题：

共用题干
Schools and Education

1. Life in the twenty-first century demands preparation.Today,all individuals in a country must have adequate schooling to prepare them for their work as well as for their responsibilities as citizens.With this in mind,national leaders everywhere are placing more emphasis on the education of the young.In the United States,government officials,parents,and teachers are working hard to give their children一tomorrow's decision makers一the best preparation available.
2. There is no national school policy in the United States.Each of the fifty states makes its own rules and regulations for its school,but there are many similarities among the fifty school systems.Public schools in all states are supported by taxes paid by the citizens of the individual state. In most states the children are required to attend school until they reach the age of sixteen.
3. When they become six years old,children begin elementary school.After six years in elementary school,they go into junior high school and remain there for three years.The last three years of their public school education are spent in senior high school,from which they graduate at the age of eighteen.
4. A great number of high school graduates continue their education in one of the many colleges or universities in the country.After four years,they receive a bachelor's degree.Some continue studying for a master's degree and perhaps a doctor's degree.

After one finishes secondary school,he may or may not________.
A:go on to study in colleges or universities
B:emphasized today
C:the taxes paid by the citizens of each state
D:to go abroad to do further study
E:attend school
F: private source

答案：A

解析：

第一段中间“national leaders everywhere are placing more emphasis on the education of the young”，各个国家领导人都注意对年轻人的教育，它是该段的中心句，所以选Co
本段最后一句“In most states the children are required to attend school untilthey reach the age of sixteen”，所以选D。
本段提到一个孩子从6岁开始到18岁接受的所有教育，即从小学教育到中学教育，因此B正确。
本段第一句说到“...high school graduates continue their education in one ofthe many colleges or universities...”所以是关于高等教育。
“emphasized”和“place emphasis on something”意思相同，即各国强调教育的重要性，所有选B。
第二段的最后一句，在大多数州，孩子在16岁前必须接受教育，因此选E。
“financed by”意思是得到资金支持，即“Public schools in all states are supported by taxes paid by the citizens of the individual state”，选项C符合句子的意思。
“secondary education”是中学教育，在学生完成中学教育后，他们可以决定是否要继续接受高等教育，因此A符合题意。

第5题：

The author seems to be mainly concerned with most fisheries’

A.management efficiency B.biomass level C.catch-size limits D.technological application.

正确答案：B

第6题：

All too often , a choice that seems sustainable（可持续的）turns out on closer examination to be problematic. Probably the best example is the rush to produce ethanol（乙醇）for fuel from corn . Corn is a renewable resource —you can harvest it and grow more, almost limitlessly . So replacing gas with corn ethanol seems like a great idea .

One might get a bit more energy out of the ethanol than that used to make it, which could still make ethanol more sustainable than gas generally, but that’s not the end of the problem. Using corn to make ethanol means less corn is left to feed animals and people, which drives up the cost of food. That result leads to turning the fallow land — including, in some cases, rain forest in places such as Brazil — into farmland, which in turn gives off lots of carbon dioxide（CO2）into the air. Finally, over many years, the energy benefit from burning ethanol would make up for the forest loss. But by then, climate change would have progressed so far that it might not help.

You cannot really declare any practice “sustainable” until you have done a complete lift-cycle analysis of its environmental（环境的）costs. Even then, technology and public policy keep developing, and that development can lead to unforeseen and undesired results. The admirable goal of living sustainable requires plenty of thought on an ongoing basis.

57. What might directly cause the loss of the forest according to the text?

A. The growing demand for energy to make ethanol.

B. The increasing carbon dioxide in the air.

C. The greater need for farmland.

D. The big change in weather.

正确答案：C

第7题：

The technological advances made it possible for the middle classes to enjoy what had once been()only to the very rich.

A. manageable

B. measurable

C. affordable

参考答案：C

第8题：

The United States today is no longer considered a“melting pot”society by many of its residents．_________ ，many people prefer the term“salad bowl”．

A．Moreover

B．More often

C．Truly speaking

D．Instead

正确答案：D
题干的意思是：“美国许多居民不再把今日的美国国作一个‘熔炉’。相反，许多人更喜欢用‘沙拉碗’这个词。”Instead的意思是“作为替代，反而，却’；Moreover(而且，此外)；More often(常常)；Truly speaking(真实地说)都没有表“替代”之意。

第9题：

What is NOT a requirement for the preparation of used，gasoline-propelled cars if they are to be carried as ordinary cargo and not as hazardous cargo ________．

A.The engine must be run until it dies from lack of fuel

B.The fuel tank must be inerted with CO2

C.The ignition key may not be in the ignition

D.The vehicle must be inspected for fuel leaks

正确答案：B

第10题：

There are many cities（）very fast.

Aexpand

Bwhich expand

Cwhich expanding

Dto expand

B
略

单选题The market for ethanol fuel in the United States ______.A is known to very few people.B limited due to technological problems.C may expand many times its present size with technological advancement.D is run by the National Ethanol Vehicle Coalition.

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