Fly the kite when a ________ appears to be coming on .Stand inside a door or under some ______, so that the silk ribbon does not get wet. Take care that the string doesn’t touch the wall or the door. When a thundercloud comes over the kite, the___ piece of metal will pull the electricity from the cloud. The kite and the string will become ______. When the kite and the string are wet from the rain, they will conduct the electricity very well. You can ____ and store the electricity in the condenser and use it for other experiments

Fly the kite when a ___1._____ appears to be coming on .Stand inside a door or under some __2.____, so that the silk ribbon does not get wet. Take care that the string doesn’t touch the wall or the door. When a thundercloud comes over the kite, the_3.__ piece of metal will pull the electricity from the cloud. The kite and the string will become __4.____. When the kite and the string are wet from the rain, they will conduct the electricity very well. You can _5.___ and store the electricity in the condenser and use it for other experiments

We bet that on cold wintry days, many of you love to stay in your warm home and, every now and then，come out into the kitchen for a snack. Unfortunately, plenty of creepy-crawly critters (爬行生物) like to do the same thing!

Winter is the time when bugs (虫子) invade your house without an invitation. The season can be tough for such creatures. In winter the air is cold, the ground is hard and many trees have no leaves. So bugs do what they have to do to survive.

Monarch butterflies head south to warmer climates. Ants crowd in deep underground colonies and eat food they have been storing all year. Many insects go into a deep sleep called diapauses. There’ re different kinds of diapauses, but all are similar to hibernation, a time when bigger animals become inactive in the cold. Insects go into an inactive period, too, but it often isn’t when the temperature drops.

They rely on more dependable signals in the environment. For example, many insects can tell how much sunlight there’ s each day. They use that to tell themselves when to shut down. Bugs are cold-blooded, meaning that their inside temperature is the same as the outside. They can’ t move much when it gets below 40 degrees Fahrenheit. So they search for any warm place.

They’ re looking for protection. These guys have been doing this for 300 million years, so they don’ t really know they’ re coming into your house. The home is a recent event in terms of their evolutionary behavior. They enter through tiny cracks or come in unnoticed on your clothes or shoes. Remember that they may be invading your homes for warmth and food, but they don’t care about humans.

46. What is the purpose of the first paragraph?

A. To point out that humans like to stay at home in winter.

B. To mean that humans and bugs have the same living habits.

C. To mean that bugs will invade humans’ houses for their winter.

D. To put forward the idea that bugs are not welcome in winter.

47. According to the text, what is diapauses?

A. It is the same as the animals’ hibernation.

B. It often appears in warm areas all the year.

C. It is done to keep bugs active in winter.

D. It is a deep sleep similar to hibernation.

48．What often decides bugs’ diapauses?

A. The lower local temperature.        B. The amount of sunlight.

C. Kinds of environmental signals.      D. The insects’ inside temperature.

49．According to the text, bugs invade humans’ homes to________.

A. attack humans            B. look for enough food

C. seek for protection         D. show their evolutionary results

50．What would be the best title for the text?

A. Bugs’ life on cold wintry days.         

B. Why do bugs invade your home in winter?

C. Good relations between humans and bugs. 

D. What does diapauses mean?

    It is   8   that the vision phone will spread   9   the office to the home．Research in telephone communications becomes   10   wide and changes are coming about so rapidly   11   no one can tell   12   the telephone will look like．But we are   13   that will be more and   14   telephones in the future and they will be better   15 

1．A．whom

B．who

C．whose

D．which

2．A．on

B．for

C．in

D．by

3．A．voice

B．sound

C．noise

D．shout

4．A．out

B．away

C．up

D．over

5．A．sees

B．comes

C．shows

D．appears

6．A．because

B．though

C．until

D．before

7．A．what

B．why

C．which

D．how

8．A．sure

B．surely

C．certain

D．certainly

9．A．in

B．from

C．outside

D．since

10．A．such

B．so

C．too

D．more

11．A．but

B．for

C．that

D．which

12．A．what

B．that

C．how

D．why

13．A．surprised

B．told

C．tell

D．surprising

14．A．many

B．more

C．much

D．most

15．A．things

B．one

C．ones

D．telephone

    A London woman wished to speak to her husband   1   is on a business trip   2   a foreign country．She lifts her telephone receiver and dials the number．After a very short time, she hears her husband’s   3   ．As he picks   4   his receiver, his picture   5   on her screen．They can speak to each other face to face   6   they are using a new kind of telephone   7   may be called a “vision phone” or a “picture phone” 

    It is   8   that the vision phone will spread   9   the office to the home．Research in telephone communications becomes   10   wide and changes are coming about so rapidly   11   no one can tell   12   the telephone will look like．But we are   13   that will be more and   14   telephones in the future and they will be better   15 

1．A．whom

B．who

C．whose

D．which

2．A．on

B．for

C．in

D．by

3．A．voice

B．sound

C．noise

D．shout

4．A．out

B．away

C．up

D．over

5．A．sees

B．comes

C．shows

D．appears

6．A．because

B．though

C．until

D．before

7．A．what

B．why

C．which

D．how

8．A．sure

B．surely

C．certain

D．certainly

9．A．in

B．from

C．outside

D．since

10．A．such

B．so

C．too

D．more

11．A．but

B．for

C．that

D．which

12．A．what

B．that

C．how

D．why

13．A．surprised

B．told

C．tell

D．surprising

14．A．many

B．more

C．much

D．most

15．A．things

B．one

C．ones

D．telephone