Which solar term starts from the fifth or sixth of May?()
A.Beginning of Summer
B.Summer Solstice
C.Great Heat
D.Grain in Ear
A.Beginning of Summer
B.Summer Solstice
C.Great Heat
D.Grain in Ear
A.bide my time
B.put pen to paper
C.set aside
D.race the clock
How much energy given off by the sun reaches the earth?
A.100 % but indirectly
B.5 %
C.0.5
D.only a very tiny amount
Some researchers recently have studied the eyes of the common frogs and have discovered that a frog's eyes only find moving things such as insect-shaped objects and large, threatening objects. As a result of studying the eyes of frogs, scientists have constructed a simple electronic model of a frog's eyes which can track airplanes circling above an airport and then provide information to computer-run air traffic control systems. Someday such electronic eyes may provide the means to automatically guide automobiles by providing information about objects moving toward the automobile. Other scientists have studied the compound eyes of some insects and crabs and have built a seeing machine that is a simple model of the horseshoe crab eye.
The hearing of a number of creatures also has been studied extensively so that hearing machines can be developed. Bats have unusual hearing which can extend into the ultrasonic (超声的) range. The dolphin also has been studied extensively, and dolphins are able to navigate through water extremely effectively. Radar and sonar(声 纳) systems which are used to help ships and planes navigate have been based on the sonar systems of both bats and dolphins.
Which of the following could be the best title?
A.Electronic Eyes
B.The Science of Bionics
C.Sonar Systems
D.The Hearing of Some Creatures
(80) Sociologists are interested in how a society began and how it grew. They also study the levels within a society. For example, the child is part of the family, the family is part of the neighborhood, and the neighborhood is part of the community. There are many different groups, and sociologists are interested in the effect that these groups have on people.
A Frenchman named Auguste Comte made sociology a separate science in the 1830s. He suggested that a new science was necessary to study a society of people. A famous book, Principles of Sociology, was published by an Englishman, Herbert Spencer, in 1882. This book had an unprecedented (史无前例的) effect on the science of sociology. In this book, Spencer theorized that a society's customs evolved, or grew, from very simple to more complicated and advanced. This theory shows the influence that Charles Darwin (who believed that man had evoked from very simple forms to the present human) had on Spencer.
What is the best title for this passage?
A.Society.
B.People's Interests.
C.Society in Different Nations.
D.Sociology.
______ is a branch of mathematic scientist.
A.Statistic
B.The statistic
C.Statistics
D.The statistics
It is known that solar power can ______ electric energy.
A.convert into
B.convert to
C.be converted into
D.be converted to
A.When
B.If
C.Now that
D.Just as
根据以下内容回答题:
John F.Kennedy was,at 43,the youngest American to be elected president,and also the first Roman Catholic.John’S grandfather was a poor Irishman who migrated to America.This immigrant and his son,Joseph,accumulated wealth and political power.Thus,John Kennedy had the advantage of wealth family and good education. During World War Il,John F.Kennedy had an outstanding record in the Navy.After the war,Kennedy worked briefly as a newspaperman,and then entered politics.He was three times elected to the House of Representatives before becoming a senator from Massachusetts.In 1960 he was elected president in a very close race in which there were charges of irregularities. Kennedy’s term of office was highlighted by appeals to idealism,a broadened base of political participation,and improved civil right.In international affairs,Kennedy saw the failure of the American.backed invasion of Cuba,and the Cuban missile crisis which brought Russia and the United States to the brink of war. The Kennedy family has known triumph and tragedy.One of John Kennedy’S sisters was mentally retarded and an older brother was killed during a wartime aerial mission.John Kennedy was assassinated——as was his outspoken brother,Robert Kennedy.The family has suffered scandals of sex,alcohol,and drugs in both John’S generation and in this present genera-tion.Many believe that for the youn9,wealth and prominent family are more of a curse than a help.
What makes John Kennedy such a famous president in American history?
A.His grandfather was an Irish immigrant who made a fortune in US.
B.Kennedv had made use of the family influence and wealth to become President.
C.His prominent family brought a curse to his political career.
D.He was the first Roman Catholic and youngest man to be elected President.
Mike's uncle insists ______in this hotel.
A.staying not
B.not to stay
C.that he would not stay
D.that he not stay
A.changed
B.altered
C.transformed
D.modified