A.caution | B.check | C.capability | D.challenge |
2 . Americans spend billions on vitamins, multivitamins for their health, but a review of numerous studies concluded there is little to no evidence that some of those vitamins prevent heart disease, cancer or death.
The report, released by the U.S. Preventive Services Task Force last week, concluded that “recent evidence is not enough” to determine whether vitamins actually help or hurt your health, based on 84 studies, 52 of which were done since 2014. Vitamins examined included vitamins A, B, C, D and E, as well as other multivitamins.
“Our suggestion is neither for nor against taking vitamins, or combinations of those nutrients (营养物质). We just don’t have enough evidence,” said Dr. John Wong, a doctor in the Department of Medicine at Tufts Medical Center who was involved in the report.
While the finding is that vitamins don’t have any benefits to “healthy, non-pregnant (未怀孕) adults”, it doesn’t apply to “children, people who are pregnant or may become pregnant, or people who are hospitalized.”
The Task Force admitted it makes sense that people would take vitamins in hopes of health benefits, as some shortage may lead to illness. But experts agreed the best way to get good health and prevent cancer is a balanced diet and regular physical activity.
“The suggestion across all organizations about vitamins is to eat a balanced diet, and then the key tends to be on plenty of fruit and vegetables and less junk foods,” Wong said.
Wong added people should refer to their health doctors to determine if any vitamins are worth taking. He said this suggestion should also serve as a need to further research into proving the official benefits and risks for each vitamin.
1. Why can’t we say whether vitamins really benefit or harm health?A.Because they really have no benefit. |
B.Because many studies have proved it. |
C.Because evidence is not enough at present. |
D.Because Dr. John Wong wasn’t involved in the research. |
A.Vitamins are of no benefit to anyone. |
B.Vitamins are beneficial to healthy adults. |
C.Children can’t take vitamins though they are in hospital. |
D.People could take vitamins if lack of vitamin may tend to illness. |
A.Taking enough vitamins. |
B.Eating more packaged foods. |
C.Following their health doctor’s advice. |
D.Having a balanced diet and doing exercise. |
A.Taking Vitamins: No Benefit to People |
B.Doctor’s Advice on Buying Vitamins |
C.Taking Vitamins: Likely to Waste Money |
D.Americans Spending More Money on Vitamins |
3 . We all have memories of what our fathers enjoyed, and all the fun we had with him: travelling, reading, or exploring the neighborhood hiking trail. Each of us has treasured stories and memories of times with dad.
The charm of storytelling,the fun of traveling, the immersion in a book...these are the gifts of a lifetime my father helped me unwrap.
My father, turning 75 this year, is still a storyteller, but his exploration of the world has turned virtual. Like almost all children, I spent my twenties walking away from his stories since I was always “occupied with my work.”
Have you ever put your ear to a seashell and heard the waves whooshing in there? On the outside, it is a hard shell — pitted, untidily edged and boldly patterned.
A.I am no exception. |
B.A father brings the world to us. |
C.In some ways, this describes fathers. |
D.However, a father can sometimes be hard on us. |
E.Inside are some valuable contents that should be treasured. |
F.Now older and wiser, I restarted listening attentively to his tales. |
G.As I look back on my childhood, I see loads of books and miles of travel. |
4 . Steph Clemence always intended to go to college. But life has a(an)
When her stepfather died in a car accident, leaving her mother to support three daughters on a(an)
The
It wasn’t homework, but it could be a(an)
Steph studied the list. Each of those books
A.efficiency | B.motivation | C.exception | D.tendency |
A.hold back | B.set up | C.give away | D.carry on |
A.display | B.move | C.threat | D.mission |
A.precise | B.independent | C.modest | D.initial |
A.breaking away from | B.taking hold of | C.giving in to | D.going in for |
A.situation | B.answer | C.procedure | D.emergency |
A.spotted | B.folded | C.loaded | D.assigned |
A.hard rock | B.far cry | C.field work | D.road map |
A.flexible | B.foundational | C.financial | D.temporary |
A.qualified | B.reliable | C.sufficient | D.delightful |
A.confirmed | B.sharpened | C.stimulated | D.bounced |
A.origin | B.treat | C.concept | D.constant |
A.discussing | B.traveling | C.whispering | D.flashing |
A.completing | B.forecasting | C.revealing | D.declaring |
A.remarks | B.works | C.proofs | D.zones |
5 . When water is cold, people will find it uncomfortable to swim. Wetsuits(潜水服)can help keep people warm.
The wetsuit doesn't have a long history. According to studies, the wetsuit only began during WWII when Italians started wearing wetsuits that were made of rubber. And it was widely believed in 1951, Hugh Bradner began working to improve the equipment.
Now there are many kinds of wetsuits. Contrary to what some may think, wetsuits do not work by keeping the diver(潜水员)dry; they are designed to let water into the suit. This thin layer of water is trapped(保存)between the diver and the suit. And it's allowed to move between the skin of the diver and the inside layer.
Wetsuits can also differ in thickness. They range from about 0. 5mm to 8mm in thickness. It's true that thicker wetsuits are more likely to affect your movement.
A.But they're much better at giving you warmth. |
B.As for the difference, wetsuits can differ in size. |
C.The history of the wetsuit is an interesting story. |
D.This led to the development of a kind of new wetsuit. |
E.Many wetsuits are very light and easy to wear and take off. |
F.As a result, the water gradually warms up to body temperature. |
G.And they can provide protection from the sun and cuts from rocks. |
6 . When I was a practice teacher in a middle school,the students in my class were always making
The evening before I would teach all by myself,I gave a piece of paper to everyone. I told them to write
I turned the cardboard case with the bottom(底部)towards the students,and told them calmly what each one had written on the paper. The students were surprised,
I told them the truth and they were
A.progress | B.troubles | C.faces | D.efforts |
A.something | B.nothing | C.all | D.them |
A.methods | B.attitudes | C.feelings | D.interest |
A.that | B.how | C.when | D.what |
A.thought | B.seen | C.written | D.heard |
A.would | B.needed | C.had to | D.might |
A.with | B.for | C.to | D.as |
A.after | B.when | C.until | D.now that |
A.put | B.left | C.had | D.gave |
A.knowing | B.believing | C.seeing | D.hearing |
A.names | B.faces | C.characters | D.handwritings |
A.frightened | B.angry | C.sad | D.amazed |
A.corner | B.bottom | C.top | D.side |
A.in | B.for | C.with | D.to |
A.it | B.that | C.them | D.those |
A.given | B.handed | C.passed | D.offered |
A.expensive | B.useful | C.another | D.smelly |
A.made | B.seen | C.found | D.looked |
A.From then on | B.However | C.Though | D.So far |
A.a lot of | B.a lot | C.partly | D.greatly |
7 . After a two-hour flight from Shanghai and an hour’s drive, I reached my destination: Jielingkou Village in Qinhuangdao City of Hebei Province, China. The tiny and
In 2018, an anti-poverty project began in the village, with the
But gaining the locals’
Ge said he hopes that as conditions are
A.rich | B.great | C.old | D.nearby |
A.reach | B.significance | C.view | D.control |
A.cost | B.knowledge | C.favor | D.goal |
A.increasing | B.ignoring | C.considering | D.deciding |
A.benefits | B.measures | C.disadvantages | D.conditions |
A.in charge of | B.in response to | C.in sight of | D.in search of |
A.independence | B.weight | C.trust | D.experience |
A.worried | B.curious | C.angry | D.enthusiastic |
A.carry | B.sell | C.boil | D.produce |
A.mistakes | B.apologies | C.improvements | D.documents |
A.hurt | B.helped | C.failed | D.escaped |
A.workers | B.fighters | C.managers | D.supporters |
A.occasionally | B.gradually | C.hardly | D.regularly |
A.clean | B.decorate | C.destroy | D.run |
A.attracted | B.monitored | C.postponed | D.welcomed |
8 . Banff National Park is home to an amazing wildlife population. But the busy Trans Canada Highway that cuts through the park is a hazard to the lovely animals. To address the problem, Banff first put-up wildlife fencing on either side of the highway to discourage animals from entering the busy road. Then, since 1996, they’ve opened six wildlife overpasses and 38 underpasses to help the animals cross the highway in safety. I was fortunate to visit Banff’s Red Earth Overpass with Trevor Kinley, the project manager with Parks Canada. He told me that so far, they have documented 10, 000 safe animal crossings on this overpass alone. “ Some animals have learned how to use the crossings much more quickly than others. Black bears are the fastest learners, followed by deer. Wolves and lions take the longest to work out how to use them, ” Kinley said, laughing. “ But those animals that are slower to adapt are usually more capable and determined at figuring out the safest way to cross those overpasses and underpasses. ”
There is some criticism (批评) that channeling so much wildlife into a few bridges and tunnels is like making a trap for the animals, offering big animals an easy meal on either side. “ But research has shown that this is not the case, ” Kinley assured me. “ There are no more killings around the crossings than there are anywhere else in the park. ”
Walking over the Trans Canada and then walking underneath through one of the tunnels, I was amazed to see the fresh tracks of black bears, wolves, deer and many kinds of smaller animals. Somehow, all these animal footprints made me so happy, knowing that all this wildlife was passing safely under and over the longest road in Canada.
Hopefully, the success of the wildlife crossings in Banff will continue to inspire similar solutions around the world, where human pressure on wildlife continues to grow.
1. Which of the following best explains “ hazard ” underlined in paragraph 1?A.Shelter. | B.Message. | C.Answer. | D.Danger. |
A.They are stupid animals. | B.They are cautious learners. |
C.They are very dangerous. | D.They are good at adapting. |
A.There are too many bridges and tunnels. | B.Many animals will not use the crossings. |
C.More killings might happen at the crossings. | D.Illegal hunting might be encouraged in the park. |
A.Concerned. | B.Disappointed. | C.Shocked. | D.Delighted. |
9 . Wu Ming, a young German born after 1995, is a big fan of Chinese culture. As he thought some diseases can’t be treated
Studying TCM also
Wu
Wu thinks there’s no big difference between China and Western countries. “
A.immediately | B.gradually | C.thoroughly | D.consistently |
A.depend on | B.dig into | C.look up | D.work out |
A.created | B.enjoyed | C.advanced | D.acknowledged |
A.overcame | B.seized | C.divided | D.shifted |
A.raised | B.sorted | C.cooked | D.tasted |
A.aspects | B.standards | C.themes | D.means |
A.enriched | B.secured | C.expanded | D.changed |
A.exposed | B.reduced | C.restricted | D.addicted |
A.businesses | B.recreations | C.routines | D.tasks |
A.balanced | B.wealthy | C.humble | D.efficient |
A.employs | B.promotes | C.outlines | D.conveys |
A.scanning | B.checking | C.exploring | D.comparing |
A.concern | B.wish | C.demand | D.passion |
A.Misunderstanding | B.Destruction | C.Stress | D.Failure |
A.source | B.basis | C.bridge | D.tool |
10 . It was a normal morning in March. Sondra Artis had just
As heading towards the school, Sondra noticed a burning smell. She
Sondra pulled into a parking lot and turned to face the 20 students on
“I told the kids that, ‘You know, we
The students hurried to the
Seconds after they all
The bus can be
“Sondra is a very good bus driver,”said a student. “She
A.sent away | B.turned down | C.seen off | D.picked up |
A.repaired | B.wiped | C.tapped | D.opened |
A.steam | B.smoke | C.fog | D.dust |
A.wrong | B.lucky | C.necessary | D.urgent |
A.anger | B.curiosity | C.embarrassment | D.worry |
A.duty | B.guard | C.board | D.vacation |
A.advantages | B.drills | C.signals | D.secrets |
A.met | B.separated | C.promised | D.practiced |
A.early | B.amazing | C.real | D.new |
A.exits | B.teacher | C.windows | D.lifesaver |
A.excited | B.tired | C.scared | D.optimistic |
A.hurriedly | B.safely | C.firstly | D.actively |
A.hid | B.landed | C.sat | D.escaped |
A.scene | B.school | C.park | D.destination |
A.searching | B.studying | C.thanking | D.counting |
A.replaced | B.exchanged | C.burnt | D.controlled |
A.eager | B.famous | C.grateful | D.qualified |
A.student | B.leader | C.driver | D.hero |
A.rewarded | B.excused | C.apologized | D.forgiven |
A.offers | B.deserves | C.demands | D.establishes |