Holonyak's colleagues thought he would fail in his research on LEDs at the time when he started it.

• A、True
  
  

• B、False
  
  

• C、Not Given
  
  

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Cell Phones:Hang Up or Keep Talking?

Millions of people are using cell phones today. In many places it is actually considered  41  (usual)not to use one. They find that the phones are more than a means of____42____(communicate)—having a mobile phone shows that they are cool and____43___(connect).

The____44____ (explode)around the world in mobile phone use make some health professional

worried.Some doctors are____45____(concern)that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative ____46____ (public)of such ideas.They say that there is no____47____(prove)that mobile phones are bad for your health.

On the other hand, signs of change in the issues of the brain and head can be____48___(detect) with modern scanning equipment. What is it that makes mobile phones____49____(potential)harmful?  The answer is radiation.

As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time.Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies.In the future, mobile phones may have a____50____ (warn)label that says they are bad for your health.So for now, it's wise not to use your mobile phone too often.

 

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Saving Money

Where you save your money often depends on what you are saving for.If you are saving to buy a dictionary or to go to a concert, then you probably keep your money  31  in your room.

If you are   32   for a big purchase like a mountain bike or a school trip, where would you save your money?

One place to save money is the bank. Putting your money in a savings account will help your money   33   more money.If you put your money in a piggy bank (豬形儲蓄罐).one year later you'll still have the   34   amount of money you put in.If you put your money in a savings account, one year later, you'll have more money than you put in.Why?

When you keep your money in a   35   , your money earns interest.   36  is the amount of money a bank pays you to use your money. The bank uses your money(and the money of other people, too)to loan money to people and businesses.

Another way you can save money is to buy a certificate of deposit or CD.If you have some money that you don't need to use for a   37  time, this is a good way to make your money  38  .

Since the bank is using your money for that time period, it will  39  you interest. You will earn more interest with a CD than in a savings account. Can you guess why? It's because you promise to leave your money in the bank for a certain period of time. Banks pay  40  rates of interest.

A.long	B.same	C.bank
D.earn	E. pay	F.grow
G.inside	H.different	I.interest
J.somewhere	K.saving	L.raise