Question

【題目】 Scientists don’t know yet whether cell phones are bad for the brain.【1】

In the experiment, the 47 participants may have looked a little strange. Each of them had two Samsung cell phones tied to his or her head—one on each ear.【2】 The phone on the right ear played a message for 50 minutes, but the participants couldn’t hear it because the sound was off. After 50 minutes with two phone attached to their heads, the participants were given PET scans. The PET scan is a way to take a three-dimensional picture of how the inside of the bodyworks.

The PET scan showed that the left side of each participant’s brain hadn’t changed from the way it was before the experiment.【3】 These right-side brain cells were using almost as much glucose as the brain uses when a person is talking. This suggests that brain cells there were active even without the person hearing or talking anything. This activity, the scientists say, was probably touched off by radiation from the phone.

【4】 They release different amounts of radiation depending on whether a person is talking or listening, the type of phone, the number of people using phones nearby, and the distance to the nearest cell phone tower. All of these changes make it difficult to collect evidence about any health risks of cell phones, since exposure to radiation can vary.

So for those who don’t want to wait to find out for sure whether cell phones are bad for the brain, there are ways to talk more safely.【5】

A.The phone on the left ear was off.

B.So an experiment was done to attempt to find it out.

C.People should avoid having a long conversation by using cell phones.

D.Cell phones do not always give out the same amount of energy.

E.You can have short conversations, use a speakerphone to keep the phone away from your head.

F.The right side of the brain, however, had used more glucose, which provided fuel to brain cells.

G.From the PET scan the differences between the two sides of the brain were observed.

Answer 1

【答案】

【1】B

【2】A

【3】F

【4】D

【5】E

【解析】

本文是一篇說明文。短文介紹了下次打電話可要記住不要超過50分鐘，因為實驗表明使用耳機接聽電話超過50分鐘，耳機會發(fā)出一種輻射。而這種輻射會對大腦有一定的影響。

【1】空格上文Scientists don’t know yet whether cell phones are bad for the brain.講述科學(xué)家不知道是否手機對大腦不好，下文第二段In the experiment可知，進行了一個實驗，故選項B“所以做了一個實驗來試圖找出它�！狈�合，上文是原因，空格處是結(jié)果，so是關(guān)鍵詞，下文的the experiment指代此處的an experiment。故選B。

【2】空格上文Each of them had two Samsung cell phones tied to his or her head—one on each ear.講述參與者每個人都有兩部三星手機，綁在他或她的頭上——每只耳朵上有一部�？崭裣挛�The phone on the right ear played a message for 50 minutes說明右耳上的電話播放了50分鐘的信息，A項“左耳的電話關(guān)機”，符合，分別介紹了兩個耳朵上的手機。故選A。

【3】空格下文These right-side brain cells were using almost as much glucose as the brain uses when a person is talking.講述這些右側(cè)的腦細胞使用的葡萄糖幾乎和一個人說話時大腦使用的葡萄糖一樣多。可推斷，空格處講述了右側(cè)的腦細胞，因此推斷F項“然而，右腦消耗了更多的葡萄糖，為腦細胞提供了能量�！狈�合語境，故選F。

【4】空格下文“They release different amounts of radiation depending on whether a person is talking or listening...”講述他們釋放不同數(shù)量的輻射取決于一個人是否在說話還是在傾聽等……，因此推斷手機并不總是發(fā)出同樣的能量。故選D。

【5】空格上文講述因此，對于那些不想等待確定手機是否對大腦有害的人來說，有一些方法可以更安全地交談。因此推斷空格處說的是解決辦法，E項“你可以進行簡短的交談，用免提電話讓手機遠離你的頭�！狈�合語境，故選E。