Dich

   In the last 100 years, technology has completely changed the way we live. At the touch of a button, we can look up almost anything we need to know on the internet. We have electricity, aero planes, television and we have ever been to the moon. So what sort of inventions will be there in the 21st century? Indeed is there anything important still left to invent?
   It seems that there is. Scientists all over the world are looking into Nan technology with a great deal of interest. This is the science of building small machines and when we say small, we mean very small. To give you an idea of the size the scientists are talking about, these machines would be about a million billion times smaller than the smallest bit of dust.
   Nan technology will bring about enormous changes. Doctors, for example, will be able to cure any illness. The environment will be improved because it will be possible to take the polluted air we breathe and make it clean again. But perhaps the most exciting thought of all is that we won’t have to wait a thousand years for Nan technology – many people believe there is a good chance it will come in our lifetime.
 
1. This passage is mainly about ____________.
A. inventions B. Nan technology
C. technological changes D. small machines
2.According to the passage, _____________.
A. our lives have been changed by technology
B. we can use the Internet to get information
C. we have been able to travel to the moon
D. All are correct
3.Nan technology is_____________.
A. the skill of building very small machines
B. the science of building computers
C. the new computer technology
D. the recent advance in medical technology 
4.Which change will Nan technology not bring about? 
A. Fatal diseases will be cured.
B. The air will be cleaner.
C. The pollution will be reduced.
D. The rare animals will be protected.
5.Which of the following is not true?
A. Scientists have a lot of interest in Nan technology.
B. The size of the machines will be much smaller than the smallest bit of dust.
C. Nan technology will bring about some changes in the medical field.
D. Many people believe that they have to wait a thousand years for Nan technology



Bai 2
   
   All early television was broadcast in black and white. Color television was possible, but it was too (1) ____ and of very poor quality (2) ____ the middle of the 1950s. Color television broadcasts began in the United States in 1954, in Japan in 1960, and in Europe in 1967.
   The first (3) ____ on the moon was broadcast (4) ____ on television in 1969, and now television programs are (5) ____ all over the world immediately through the (6) ____ of the satellites that transmit the (7) ____ from the earth, through (8) ____, and back to the earth. More people now (9) ____ their news and information through television than through newspapers and radio. The development of television is one of the most rapid and exciting (10) ____ of our century.
 
1.A. bulky B. complicated C. expensive D. valuable
2.A. until B. from C. through D. on 
3.A. arriving B. flying C. landing D. moving
4.A. live B. active C. current D. quick
5.A. grown B. developed C. practiced D. transmitted
6.A. way B. use C. works D. system
7.A. sounds B. pictures C. signals D. programs
8.A. space B. atmosphere C. distance D. area
9.A. have B. get C. take D. bring
10.A. problems B. facts C. events D. issued





Bai 3
      There are thousands of different kinds of microbes. Microbes called (1) _______ are the smallest living things. Bacteria live almost everywhere: on land, in water, and even (2) _______ you.
   Some microscopic life forms are like plants. Tiny diatoms are microbes that live in lakes and the oceans. Diatoms soak up (3) _______ and use its energy to make food, just like plants.
   Some microscopic life forms are more (4) _______ animals. Protozoa such as the amoeba and