About 21,000 young people in 17 American states do not attend classes in school buildings．
Instead, they receive their elementary and high school education by working at home on computers．The center for Education Reform says the United States has 67 public “cyberschools” and that is about twice as many as two years ago．
The money for students to attend a cybersehool cotes from the governments of the states where they live．Some educators say cyberschools ieci money that should support traditional public schools．They also say it is difficult to know if students are learning well．
Other educators praise this new form of education for letting students work at their own speed．These people say cyberschools help students who were unhappy or unsuccessful in traditional schools．They say learning at home by computer ends long bus rides for children who live far from school．
Whatever the judgment of cyberschools, they are getting more and more popular．For example, a new cyberschool called Commonwealth Connections Academy will take in students this fall．It will serve children in the state of Pennsylvania from ages five through thirteen．
Children get free equipment for their online education．This includes a computer, a printer, books and technical services．Parents and students talk with teachers by telephone or by sending emails through their computers when．necesary．
Students at cyberschools usually do not know one another．But 56 such students finished studies at Western Pennsvlváni? Cyber Charter School recently met for the first time．They were guests of honour at their graduation．
(1)
What do we know from the text about students of a cyberschool?
[ ]
A．
They have to take long bus rides to school．
B．
They study at home rather than in classrooms．
C．
They receive money from traditional public schools．
D．
They do well in traditional school programs．
(2)
What is a problem with cyberschoois?
[ ]
A．
Their equipment costs a lot of money．
B．
They get little support from the state government．
C．
It is hard to know students' progress in learning．
When you donate blood, a small amount is usually taken in advance to test your blood type．If you are O＋, the O is your ABO type and the＋is your Rh type．It is possible to be A,B,AB, or O as well as Rh＋or Rh-．
The ABO system was discovered by Karl Landsteiner in the early 1900s．He was awarded the Nobel Prize for his achievements．There are four basic types of blood in the ABO system：A,B,AB and O．Everybody is born with one of these four types of blood．We get blood type, just like hair color and height from parents．Because of the substances(物质)contained in each type, the four groups must be transfused carefully．If two different blood types are mixed together, it may put a person into an extremely dangerous situation．Basically, A and B cannot be mixed．A and B cannot receive AB, but AB may receive A or B．In an emergency, type O blood can be given because it is most likely to be accepted by all blood types，so it is often called the universal donor．However，there is still a risk．For the opposite reason，AB is sometimes called the universal receiver．However，because there can be so many reactions in transfusions，patients usually receive only salt until their blood can be matched as exactly as possible in the blood bank of the hospital．
There is a relationship between your blood type and your nationality．Among the Europeans, about 45 percent have type O while 42 percent have type A．The rarest is type AB．Other races have different percentage．For example, some American Indian groups have nearly 100 percent type out of 100 donors in the world．
(1)
Which of the following shown the correct relationships in blood transfusions?
[ ]
A．
B．
C．
D．
(2)
The underlined word “transfuse” most probably means ________．
[ ]
A．
to put the blood into a container
B．
to move the blood from one place to another
C．
to put the blood of one person into the body of another
D．
to give power to another person
(3)
The text mainly tells us ________．
[ ]
A．
about the basic types of human blood
B．
what kind of blood is the most common
C．
about Karl Landsteiner who won the Nobel Prize
D．
the relationship between blood type and nationality
