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题型:阅读理解-阅读单选 难度:0.85 引用次数:47 题号:12865435

Sunflowers are something most of us usually think about in August, but with the arrival of the seed catalogs(分类), winter is a good time to start thinking about which ones you might want to grow this coming year. Most gardeners are familiar with the tall giant sunflowers. But there are three or four dozen other varieties.

First, you need to understand that sunflowers don’t all bloom at the same time. In my trials I grouped. them according to bloom time. Early means they bloom in late July or early August. The mid-season ones bloom in mid-August. The late season sunflowers usually flower from late August to early September.

For the early sunflowers, in my trials Pacino was one of the best one year, but was not as striking this past year. It has yellow flowers, about four inches across, and is about two fee high. Other low-growing, early choices are the yellow Sunspot, Del Sol, or Dwarf Yellow Spray. The latter has a lot of branches as its name indicates. Double Dandy is an early, low, red and yellow combination.

For the mid-season choices, this past year my best performers included three varieties that attain heights of five feet—the red-orange Claret, the strikingly dark red Moulin Rouge, and the gold Sunny. Two four-foot sunflowers that I’d recommend for home gardens are the red-yellow combination Ring of Fire, an All-America Selections Award winner, Lemonade, with its interesting mix of light and yellow petals(花瓣).

If you are looking for a late season variety, my favorite is Titanic, a double gold, four-foot tall variety that bloomed much of September and into October in my trials this past year. Other good choices include the light yellow Valentine, the gold Soraya, and the double gold Giant Sungold. This winter, as you leaf through(翻阅) the seed catalogs as the the snow gently falls outside your window, think about summer sunflowers. Thoughts of these flowers are sure to warm the coldest of winter days.

1. What can we learn from the first paragraph?
A.There are many different varieties of sunflowers.
B.The writer likes the tall giant sunflowers best.
C.You can try to grow sunflowers in winter.
D.Sunflowers only bloom in August.
2. Which kind of sunflower may you see in late July or early August?
A.Sunny.B.Claret.
C.Moulin Rouge.D.Dwarf Yellow Spray.
3. What do we know about “Ring of Fire” from the text?
A.It is two feet high and about four inches across.
B.The color of it is a combination of red and yellow.
C.It can only be planted in the southern areas of America.
D.It usually blooms much of September and into October.
4. How many kinds of late sunflowers are mentioned in the text?
A.Two.B.Three.C.Four.D.Five.

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【推荐1】Steve Forest is a scientist. He’s standing on an island off the coast of the Antarctic Peninsula. Below him are several hundred penguins and their children. Forrest’s job is to count every one of them. It's snowing. There is a big wind, too. And their children won’t stay still. Penguins are great climbers. So Forrest and the team members must be too. And penguins aren't always clean.

Forrest has been coming to Antarctica every January for six years. He's helping count the area’s penguins. This will help researchers better understand the Antarctic environment. There used to be lots of penguins in Antarctica, “It's all because of climate change,” Heather J. Lynch says seriously. She is leading the research team. The team member Noah Strycker adds, “We know climate change is hitting the Antarctic Peninsula harder than anywhere else in the world. We are following the situation closely.”

Scientists think that warming waters do harm to krill, the tiny animals that penguins eat. This is bad for the sea life. But krill are hard to study, so researchers pay attention to penguins. They’re easier to follow. They return to the same place each year to lay eggs. If penguins aren't doing well , krill probably aren't either. “Penguins give us an idea about what is going on in the sea around us,” Forrest says.

This year, Lynch’s research team uses a drone to help them. They fly it over an area to take pictures to count penguins.

Counting penguins is quite necessary. The more we learn, the more we know about krill and the ocean animals that depend on them. When we understand them, we can start fixing them. We should consider carefully what Lynch says: “What’s happening in the Antarctic is happening everywhere.”

1. What is required of scientists like Forrest according to Paragraph 1?
A.Being clean.B.Being good at math.
C.Being cool-headed.D.Being skilled in climbing.
2. What's the point of counting penguins in the Antarctie?
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C.To have a better knowledge of the Antarctic environment
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A.Penguins lay eggs in the same place on the island every year.
B.The penguin population is increasing due to climate change.
C.The penguin population determines the krill population.
D.Climate change is most obvious in the Antarctic Peninsula.
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Pimiento is the lead author of a study published in Science Advances that looks at how the extinction of large marine species would impact the ecological roles of ocean ecosystems. “The extinction crisis challenges scientists to better measure biodiversity: how will the total variety of life on Earth be affected as human activities lead to the losses of more and more species?” they said. In the oceans, the biggest animals are thought to play crucial ecological roles, and are also facing high levels of threat from human activities such as fisheries and climate change.

The team was looking to move beyond traditional species extinctions, to find out more about the functional diversity, the range of roles that these species perform, and how biodiversity might respond under different extinction scenarios. They ran two different extinction scenarios. In one, researchers looked at extinction probability based on their current IUCN (International Union for Conservation of Nature) status. In the second, they assumed all species listed as threatened, around 40 percent, had gone extinct.

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The good news is that the study identifies key species that can be targeted and protected. Sometimes ocean conservation can be a triage game. The science helps us know which species really need our help and which species we really cannot afford to lose.

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C.The influence of sharks’ extinction on the ocean.D.The reason for sharks being hit hardest in the sea.
4. What is the author’s attitude towards the study?
A.Indifferent.B.Positive.C.Skeptical.D.Negative.
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