五、補(bǔ)全短文。
1.
Heavy Sleep
Weighing too much can damage your health, and obesity is a growing problem for both kids and adults around the world.
________（1）. A new study has found that elementary school students who slept too little were more likely to gain pounds.
In the United States today, some 9 million children over the age of 6 are obese.
Past studies have shown a link between sleeping less and weighing more, but scientists have had a tough time determining "which came first, the chicken or the egg," says Julie C. Lumeng of the University of Michigan in Ann Arbor.
In other words, it hasnt been clear whether kids who weigh too much have trouble sleeping, or ________（2）. Both scenarios seemed equally possible.
To get a better idea of which causes which, Lumeng and colleagues interviewed the parents of 785 third graders from around the United States. The parents answered questions about how well their kids slept that year. ________（3）.
By sixth grade, 18 percent of kids involved in the study were obese. The scientists found no relationship between weight and the student’s race or gender. It also didn’t matter how strict their parents were, or whether they were boys or girls. ________（4）.
Instead, sleep seemed to be the key factor. Over the 3 years of the study, the children averaged a healthy 9.5 hours of sleep a night. Some kids, however, slept a lot more－or less－than others.
For the sixth graders, every hour of sleep above the 9.5-hour average was linked to a 20 percent lower risk of being obese. ________（5）. Every extra hour of sleep they got was linked to a 40 percent drop in obesity by sixth grade.
"I expected we’d find that this sleep link with obesity was just a bunch of bunk," says Lumeng, a pediatrician. But their findings were convincing. No matter how her team looked at the link, "we couldn’t make it go away."
A Obesity struck all of these groups equally
B Three years later, the parents answered the same questions
C They found that obesity is a serious problem.
D Whether sleeping less leads to weight gain.
E Sleep appeared doubly important for the third graders.
F Sleep might be one answer to the problem
六、完型填空。
1.
Cell Phone Lets Your Secret Out
Your cell phone holds secrets about you. Besides the names and ____1____ that you’ve programmed into it, traces of your DNA linger on the device, according to a new study.
DNA is genetic material that _____2___ in every cell. Like your fingerprint, your DNA is unique to you _____3___ you have an identical twin. Scientists today routinely analyze DNA in blood, saliva, or hair left ____4____ at the scene of a crime. The results often help detectives identify criminals and their _____5___. Your cell phone can reveal more about you ____6____ you might think.
Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the _____7___. This made her wonder whether traces of DNA lingered on cell phones--even when no blood was involved. ____8____ she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones of 10 volunteers. They used swabs to collect ____9____ traces of the users from two parts of the phone: the outside, where the user holds it, and the ___10_____, which is placed at the user’s ear.
The scientists scrubbed the phones using a solution made mostly of alcohol. The aim of washing was to ____11____ all detectable traces of DNA. The owners got their phones ____12____ for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more.
The scientists discovered DNA that ____13____ to the phone’s speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. ____14____, DNA showed up even in swabs that were taken immediately after the phones were scrubbed. That suggests that washing won’t remove all traces of evidence from a criminal’s device. So cell phones can now be added to the ____15____ of clues that can clinch a crime-scene investigation.
(1).A numbers B music C secrets D films
(2).A appeals B appoint C appears D applies
(3).A because B unless C although D still
(4).A about B in C for D behind
(5).A victims B death C men D policemen
(6).A when B until C before D than
(7).A device B paper C file D document
(8).A However B So C But D Nevertheless
(9).A invisible B non-existent C visible D apparent
(10).A card B keys C screen D speaker
(11).A regain B remove C stay D keep
(12).A upon B without C back D with
(13).A was given B belonged C was owned D became
(14).A Generally B Surprisingly C Disappointedly D Shortly
(15).A explanation B discovery C book D list
(1).A numbers B music C secrets D films
(2).A appeals B appoint C appears D applies
(3).A because B unless C although D still
(4).A about B in C for D behind
(5).A victims B death C men D policemen
(6).A when B until C before D than
(7).A device B paper C file D document
(8).A However B So C But D Nevertheless
(9).A invisible B non-existent C visible D apparent
(10).A card B keys C screen D speaker
(11).A regain B remove C stay D keep
(12).A upon B without C back D with
(13).A was given B belonged C was owned D became
(14).A Generally B Surprisingly C Disappointedly D Shortly
(15).A explanation B discovery C book D list