4．Your brain controls everything you do．It makes it possible for you to think，learn，create and feel；to blink （眨眼）and breathe and for your heart to beat-this fantastic control center is you brain．It is so amazing that a famous scientist once called it"the most complex （复杂）thing we have yet discovered in our universe"．
Can this small grey organ （器官），which weights less than one and a half kilos，really do so much？Amazingly，your brain contains about 100 billion neurons （神经元）-it would take you over 3000 years to count them all．Believe it or not，the activity in your brain never stops．Your neurons create and send more messages than all the phones in the world．And although one neuron creates only a little electricity，all your neurons together can producce enough electricity to power a light bulb （灯泡）．"
So exactly how fast does your brain work？Well，imagine this：a bee lands on your foot．Neurons in your skin send this information to your brain at a speed of more than 240 kilometers per hour．Your brain then uses other neurons to send the message back to your foot to shake the bee off quickly．These neurons can send this information at more than 320kilometers per hour．No computer has your brain's unbelievable ability to deal with the amount of information coming from your eyes，ears and other sensory organs．
But how does your brain allow you to learn things that you will use in the future？The structure （结构）of your brain changes every time you have a new thought，remember or learn something．For example，riding a bike seems impossible at first，but soon you are able to do it．How？As you practice，your brain sends"bike riding"messages again and again．Soon，the actions are learnt and Yuri are able to ride a bike easily from then on．

42．From the passage we know that neuronsC．
A．receive messages very slowly    
B．are only found in your skin    
C．send messages to your brain      
D．need electricity to work
43．In Paragraph 3，the writer mentions computers toA．
A．compare them with the human brain     
B．show how fast they have become    
C．say that computers have no abilities      
D．ask people to use computers more
44．When you have a new thought，D．
A．your brain will power a light bulb     
B．your heart beats faster    
C．you remember something     
D．the structure of your brain changes
45．The article is mainly aboutB．
A．all the steps when your brain learns things     
B．what an unbelievable organ the human brain is         
C．how the brain makes people smarter than computers    
D．the things you can do to make your brain work faster．

3．
阅读以上歌词，根据其内容判断下列各句正误．正确的写"A"，错误的写"B"．
81．The princess played inside the castle．B
82．The princess wanted to kiss the toad．B
83．There was a lake near the rock．A
84．The toad turned into another beautiful princess．B
85．The princess wanted to marry the prince．A．

2．      the sun was shining，it wasn't very warm．（　　）

A．

Because

B．

If

C．

Although

D．

Since

1．--What about going to Jingpo Lake for a trip next weekend？
--Ok．But I'm not sure _____ it will rain．（　　）

A．

whether

B．

where

C．

why

20．Adventure（冒险）travel is a great way to see the world．It is a kind of tourism，often to far places．Adventure travel often includes adventure activities such as mountain climbing，rock climbing and so on．
  These activities may bring risks to your health and safety．But they can be fun exciting and safe if you prepare for your trip and follow safety rules．
  Make an appointment（预约）with a doctor about a month before your adventure travel．Be sure to talk to the doctor about your planned adventure activities．He or she may give you some special advice．
  Take a first-aid course two weeks before your adventure travel．Consider taking a first-aid box with you．If you get hurt during your trip，you can give yourself some simple medical care
  You'd better buy travel insurance（保险）before you set off．
  During your adventure travel，you should also follow some rules．The following are some of them．
  Wear protective clothes when doing adventure activities．
  Always follow safety advice from your guides．
  If you go somewhere hot，be sure to take sunglasses with you．They can protect you against the sun．
                             Adventure travel

Meaning	a great way to see the world a kind of tourism，often to（56） far places
Examples	Mountain climbing （57）Rocking climbing
Influence	Advantages	（58）Fun、exciting and safe
	Disadvantages	Risks to your health and safety
（59）Advice	Before travel	Talking to the doctor Taking a first-aid course Buying travel insurance
	During travel	Wearing protective clothes （60）Following safety advice Taking sunglasses

19．It might be a boy's room_____ the clothes look like boys'clothes．（　　）

A．

when

B．

because

C．

but

18．--I'm afraid that I can't do it well．
--You should believe in yourself．You won't know what you can do _____ you try it．（　　）

A．

until

B．

if

C．

while

D．

although

17．I won't give it uphowever（尽管多么）hard it is．

16．Turnright（右边）at the second crossing and you'll see the bookshop．

15．Ihave（有）a toy cat．