1.Scientists expect that the atomic clocks will be ______. a.more precise b.absolutely accurate c.more durable d.indestructible
2.The heart of the atomichron is _______. a.acesium atom b.an ammonia molecule c.a nitrogen atom d.a hydrogen
3.From theselection,we may assume that temperature changes_______. a.affect only ammonia molecules
b.may affect the vibration rate of atoms c.affect the speed at which atoms travel d.do not affect atoms in any way
4.Identical atomic clocks may be used to check______. a.the effect of outer space on an atomic clock b.the actual speed of an orbiting satelite
c.the accuacy of predictions based on theories of relativity d.all of Einstein's theories
5.Implied but not stated:_______.
a.Precise timekeeping is essential in science
b.Scientists expect to disprove Einstein's relativity theories c.Atomic clocks will be important in space flight d.The rate of vibration of an atom never varies
第24篇答案:aabcc
Kite flying is the sport of sending up into the air,by means of the wind , a light frame covered with paper,plastic or cloth. The frame can be one of many different shapes and is attached to a long string held in the hand or wound on a drum. Kites have a long history of practical application and many different types of kite have been debeloped to serve various purposes.
The ancient Chinese used bird-kites to carry ropes across rivers and valleys. The current folding kite which will dive excitingly is an improved type of such
a kite. With its long flat body and single pair of bird-like wings,it looks just like a large bird in the air. The modern version is usually made of tissue-paper rather than the traditional silk.
Man-lifting kites were developed in ancient times, again by the Chinese, for getting information from walled cities and army camps. In fact , as recently as world 2 ,German U-boats flew kites from their towers to lift people into the air to watch the land. These kites ,which are no longer in existence,were made of light-weight cloth.They were much larger and stronger than the Chinese ones. Their design,however, was simply that of the cutter kite. Smaller in size,this type of kite is still very popular as a toy for children, being easy to make with a diamond-shaped frame,no wings and brown-paper covering.
Box-kites are another type of kite found in toy shops today. The first box-kite,named for its box-like body,was developed in the nineteenth century to test theories of flight and this type of cotton-covered kite greatly assisted the success of early aeroplane.These kites are the ancestors of a heavier version of the box-kite,which consists of two main sections,placed side by side. Developed for the peacetime purpose of fishing in strong sea wind,it is the only modern kite described which has practical value . A long-lasting plastic material has to be used for this kite,which carries fishing lines.
1.The ancient Chinese bird-kites were usually made of light frames covered with_____. a.silk b.paper c.cloth d.plastic
2.The kites used by German U-boats in would war 2 for the military purpose were made of _____. a.brown paper b.plastic material c.light-weight cloth d.traditional silk
3.The ancient Chinese man-lifting kites were used_____. a.to carry ropes across rivers and valleys b.for the military purpose
c.as toy for children
d.for fishing in strong sea wind
4.Which of the following statements is not ture?
a.The frame of a kite is attached to long string held in the hand or wound on drum.
b.The ancestor of the double box-kite.
c.The cutter kite has a diamond-shaped body but no wings.
d.The current folding kite is developed to test theories of flight.
5.The best title for this passage may be______. a.The ancestors of modern kites b.The history of the chinese kites c.different types and uses of kites
d.the different between ancient and modern kites.
第35篇答案：acbdc
第26篇
Accreditation is a system for setting national standards of quality in education. The United States is unique in the would because its accreditation system is not administered by the government , but rather by committees of educators and private agencies, like the Middle States Association of Colleges and Secondary Schools and the Society of Engineers.
Before registering to study in any educational institution in the U.S.,a student should make certain that the institution is accredited in order to assure that the school has a recoginized standard of organization,instruction,and financial support. Foreign students should be particularly careful to check an institution's accreditation because other governments or future employers may not recognize a degree earned from a school that has not recevied accreditation.
If a college is accredited,catalogues and brochures will usually indicate the accreditation status. If you are not sure about a certain school,don't hesitate to check its requtation with an education officer at the nearest U.S. embassy.
1.The word 'unique' in line 2 most nearly means_______. a.unusual
b.first c.standard d.large
2.What school students do in order to check the accreditation of a school that may interest them? a.Write to the school
b.Write to the U.S.Ministry of Education c.Register to study at the school d.Consult a U.S. embassy offical
3.From this passage, it may be concluded that an unaccredited school____.
a.does not coffer degree
b.may close because of financial disorganization c.is administered by the government d.is better than an accredited school
4.The title that best expresses the ideas in this passage is _____. a.studying in the untied states b.accreditation
c.how to find the best school
d.the middle states association of colleges and secondary schools
第26篇答案：adbb
Personality is , to large extent,inherent --A-type parents usually bring about A-type offspring.But the environment must also have a profound effect,since if competition is improtant to the parents, it is likely to become a major factor lives of their children.
One place where children soak up A characteristics is school,which is ,by its very nature,a highly competitive institution. Too many schools adopt the \achievements. The current passion for making children compete against their classmates or against the clock produces a two-layer system,in which competitive A types seem in some way better than thier B-type fellows.Being too keen to win can have dangerous consequences:remember that Pheidippides ,the first marathon runner,dropped dead seconds after saying:\
By far the worst form of competition in school is the disproportionate emphasis on examinations . It is a rare school that allows pupils to concentrate on those things they do well.The merits of competition by examination are somewhat questionable,but competition in the certain knowledge of failure is positively harmful.
Obviously, it is neither practical nor desirable that all A youngsters change into 'B's. The would needs types,and schools have an important duty to try to fit a child's personality to his possible future employment. It is top management.
1.Acoording to the author,waht factors contribute to the building of personality? a.inheritance
b.inheritance,competition and environment c.competition d.environment
2.Which of the following statements is not ture according to the author of the passage?
a.Schools usually adopt severe competitive policies. b.Students are often divided by competition results.
c.School is place where children cultivate their characteristics. d.The stronger desire for winning,the better.
3.The phrase \ a.pull up b.take up c.take in d.pull in
4.What attitude does the author hold toward examinations in schools? a.positive b.negative c.doubtful d.neutral
5.what suggestion does the author make concerning the management of schools? a.All students be made into competitive A types.
b.A child's personality be considered in regard to his possible future