Read the following text and choose the most suitable heading from A-F for each paragraph. There is one extra heading which you do not need.
A.Reasons for the use of Podcasting B.Definition and origin of Podcast C.Importance of Podcasting at school D.Advantage of Podcasts over other audio media E.Podcasts—a further step from voice recordings F.Devices needed for Podcasting |
1.
Recently a group of second –graders visited our school library to work on a “holidays around the world” project. The children created pictures showing holiday customs and then created voice recordings explaining what they drew. The incident showed very clearly the effectiveness of student-created voice recordings. Now imagine taking things one step further and creating Podcasts in a classroom setting.
2.
The term Podcast refers to an audio recording, linked to the Wed, that can be downloaded to a personal MP3 player. The word is created from broadcast and from iPod ---the wildly popular MP3 player from Apple.
3.
Using audio with students isn’t new, of course. Teachers have used audiobooks at listening centers and recorded student voice on tape or CD or many years. Voice and music are the original media for teaching. Podcasts ,however, can reach a much wider audience in a time frame outside the school days. Booktalking , an old way of getting kids excited about books, gets a tech assistance with Podcasting. Students can do some booktalking themselves; book review Podcasts seem to be another natural way for students to share what they know, providing an alternative to the book report.
4.
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There are a number of excellent reasons for using Podcasting. Teachers made audio Podcasts, including visuals or video clips for any content area instruction and review. Some teachers have begun to record themselves teaching important concepts; this creates an account of information online for kids to access when they’re stuck on a homework assignment. Audio and video files can also function as assessment tools. Imagine being a classroom teacher in September who can actually hear how his or her students were reading in June the school year before.
5.
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You don’t need an iPod to make a Podcast. If you have a computer, a microphone, and some free software, you can make a Podcast. While an MP3 player is a popular and useful gadget, your audience doesn’t need MP3 players to listen, either: your students and their families can use the computer to play back what you’ve recorded.
When we donate(捐献)blood, a small amount is usually taken in advance for at least ABO and Rh systems typing. 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…
84 donors are Rh+ | 16 donors are Rh- |
38 are O+ | 7 are O- |
34 are A+ | 6 are A- |
9 are B+ | 2 are B- |
3 are AB+ | 1 is AB- |
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 writer suggests that the third most common blood type among the Europeans is _________.
A.B B.A C.AB D.O
4.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