题型:阅读理解 题类:常考题 难易度:普通
上海市杨浦区2021届高三上学期英语期中试卷
In 2013 Mr. Baugher planted 7,000 Fuji apple trees in the orchard (果园).Three years later,just when the trees should have been bearing fruit, he noticed that a few of them had yellow leaves. Within weeks they were dead. The next year,the problem spread to more than a few trees. By last year, 2, 000 of Mr Baugher's 7,000 new trees were dead.
Mr. Baugher has the worst case of" rapid apple decline" (RAD)in the county, but he is not alone. The mysterious disease has been troubling growers across America's northeast for at least six years. Kari Peter, a fruit-tree specialist first observed massive die-offs in her research orchard in 2013. She came up with the term" RAD". But her attempts to explain it have not produced much fruit. The usual reasons for the death of tree-mould infestation, a known virus, disease, an early frost-didn't fit symptoms. Her investigation only ruled things out.
The dead trees tend to be younger: two to eight-years-old. They are nearing he prime of production. Dwarf trees, which are commonly used by commercial growers, seem to be the most subject. Historically, orchards held 600-700 apple trees an acre, but most are now high producing dwarf trees, which are more compact. Growers plant 1, 200-1, 500 trees per acre. Working with the Department of Agriculture Kan found a new hidden apple virus in the infected trees. But they cannot be sure if this new virus has any connection with the decline.
Researchers at Cormell University found that severe cold followed by drought (旱灾)could have weakened the trees leaving them subject to viruses. Other scientists think that herbicides may be to blame. Dan Donahue, a fruit-tree specialist says it could be any or all of those theories. In a recent sampling, he found that 64% of young trees had hidden viruses. These do not show symptoms, but they could affect vitality. Older, larger apple trees were better at shrugging off the viruses.
RAD is a big worry for the apple growers. Customer taste is changing. Traditional varieties like Red Delicious are no longer a customer favourite, so growers are having to invest in new varieties. Few of the orchard growers are able to absorb the economic losses.
Mr. Baugher found some relief in the Tree Assistance Programme, through which the federal government provides financial assistance to orchard-owners whose trees are damaged by natural disasters. The sudden death of apple trees may not seem as dramatic as a hurricane, but it is perhaps even more dangerous. Americans have given considerably more before in the defense of apple pie.
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Family Fun in Canadian Museum of Nature
Bring the whole family to rediscover our fully redecorated museum.
WHAT TO SEE AND DO
Check out What's On for all the events, educational activities and HD movies happening during your visit. Care for birds, dive down into the depths at the helm (舵柄) of a research submersible(潜水器) or explore a cave… on the first floor. Don't miss our gallery play areas on the third floor when visiting with kids. By visiting here, your children will learn more about nature. Check out Our Exhibitions which present our special exhibitions and our galleries. Be sure to stop at our Nature Boutique on the second floor for a vast selection of games, books and nature-related souvenirs from 9:30 am until the museum closes for the day.
HOURS, ADMISSION, SERVICES AND MORE
Opening hours: Regular Hours (September 4 -May 31) 9 am-5pm except Monday and Thursday Summer Hours (June 1-September 2) 9 am-6 pm(Saturday-Wednesday) 9 am-8 pm(Thursday and Friday) |
General Admission: Free for members. Adult: $14.50 Senior (65+): $12.50 Student (18+): $12.50 Student (13+): $12.50 Child (3–12): $10.50 Tiny Tot (0–2): Free A general admission ticket is required—even when the price is free, as it is for members and Tiny Tots—if you want to see a movie or a special exhibition. Buy a combo that includes both tickets already. Ticket combo includes general admission and a 3D movie. Adult: $18.50 Senior (65+): $16.50 Student (18+): $16.50 Student (13+): $16.50 Child (3–12): $14.50 Tiny Tot (0–2): Free Member: $3 |
Parking: Paid parking is available on the Canadian Museum of Nature grounds. Rates: $3 per half hour maximum of $14 per day (until 4:30 am) evening flat rate: $5 (4:30 pm -4:30 am) Charges accumulate (evening and next day) for vehicles that are parked overnight. |
The Canadian Museum of Nature provides a host of information, images and videos on our websites about nature, such as http://www.nature.ca/en/family-fun and http://www.expeditionarctic.ca/.The museum also participates in several social networks. Follow us on Facebook, YouTube, Instagram and Twitter.
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