Cell phones operate with radio frequencies,a form. of energy located on the electromagnetic spectrum between FM radio waves and the waves used in microwave ovens,radar,and satellite stations.Cell phones do not emit ionizing radiation,the type that damages DNA and is known to have the ability to cause cancer.
Cell phone technology works on a system of geographically separated zones called"cells".Each cell has its own "base station" that both receives and emits radio waves.When a call is placed from a cell phone,a signal is sent from the cell phone antenna to that cell's base station antenna.The base station responds to the cell phone signal by assigning the phone an available RF channel.When the RF channel is assigned,radio signals are simultaneously received and transmitted,allowing voice information to be carried between the cell phone and the base.The base station transfers the call to a switching centre, where the call can be transferred to a local telephone carrier or another cell phone.
6.There has existed argument about the link between cell phone and brain tumor()
7.The rapid growing number of cell phone users has been a great concern in the US()
8.The 3rd paragraph tries to prove that cell phones do not cause brain cancer()
9.A switching centre is needed when we make a call through cell phone()
10.The topic of the passage is about cell phone and cancer.()
1、How many homes altogether (总共) were damaged in the storm?()
A.Fourteen
B.Twenty-one
C.Twenty-nine
D.Thirty-six
2、Where was Mr. Tan when the storm first began?()
A.He was in bed
B.He was inside the house
C.He was outside the house
D.He was on the roof
3、Mrs. Woo and her family didn’t get hurt because ______.
A.her husband knew there would be a storm
B.they were all outside the house when the storm became worse
C.she felt the house was moving
D.the welfare department helped her
4、The underlined word “shelter” in this passage means ______.
A.something to eat
B.something to wear
C.somewhere to study
D.somewhere to stay
5、Which of he following may be the best title for this passage?()
A.Terrible Storm
B.A Lucky Woman
C.Good Soldiers
D.Clever People
tely, we can locate the failure through steps below:
A.get through
B.get over
C.pass
D.smooth over
A.break down
B.come down
C.settle down
D.slow down
此题为判断题(对,错)。
kitchen and sit down (2) to him and read articles from the front page of the (3) . When I ran into a word I didn’t know (and I didn’t know half of the article, because any word (4) than a couple of syllables gave me trouble) he explained the (5) of the word and gave me the (6) .Then he’d send me (7) to the sentences so I could understand the word in (8) . Then I would take the paper away with me, armed now with the meaning of those words, and reread and reread the article (9) that the meaning of those words would get(10) into my memory. Every evening we did that.
Petra
It ____1____ one night at our local nightclub. I was dancing, and suddenly I ____2____ the feeling that someone was watching me. I looked around and saw a boy on the other side of the room staring at me. I ____3____ to be brave and walked over to him. Hans was very shy but we had a drink and started talking. We just clicked and we quickly became friends.
Ricardo
It was New Year’s Eve and I ___4____ some people around to my house to celebrate. I planned a quiet party but my friends brought other friends and by twelve o’clock there were lots of people. I was ____5____ some drinks in the kitchen when I noticed this woman on her ____6____. She didn’t seem to know anybody, so I ____7____ over to her and ____8____ myself. She said, “So you’re not Antonio, then!” She was at the wrong party– she had made a____9____ with the address! I asked her to stay and we got on really ____10____…and now we’re together.
1、A、came
B、happened
C、went
2、A、had
B、felt
C、sensed
3、A、told
B、liked
C、decided
4、A、invited
B、loved
C、asking
5、A、washing
B、making
C、playing
6、A、side
B、self
C、own
7、A、ran
B、went
C、leaned
8、A、introduced
B、asked
C、talked
9、A、fuss
B、wrong
C、mistake
10、A、good
B、well
C、fine