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2021-2022年100所單元測(cè)試各科試題及答案

2. (2021高二下·杭州開(kāi)學(xué)考) 閱讀理解 A new report connects eating eggs to an increased risk of heart disease. The results follow several earlier studies that found eating eggs was generally healthy. The study collects data from six other earlier studies. It shows a 6 percent increased risk of heart disease when the number of eggs a person ate each day increased by half an egg. Norrina Allen, an associate professor at Northwestern University said that, in the United States, eggs are generally one of the top sources of cholesterol(膽固醇)in a person's daily food. People with higher levels of cholesterol in their food are at increased risk of the development of heart disease later in life. However, Allen added that she would not say that eggs are completely unhealthy. "I'm not saying that people should take them completely out of their food," she said. "I'm just suggesting that people eat them in a proper amount." Some experts believe the new study does not prove that eggs are causing heart disease. "Cholesterol's role in the development of heart disease has been discussed for more than 30 years," said Bruemmer, an associate professor of medicine at the University of Pittsburgh Medical Center. "This study does have clear shortcomings, including self-reporting at a single time point," he added. Bruemmer said, "Eggs in moderation(適度)are probably acceptable from a nutritional standpoint." "Moderation," he added, "is less than one egg a day, including eggs in foods such as bread". Holly Andersen, a doctor at the NewYork-Presbyterian/Weill Cornell Medical Center, agrees that the study has "real shortcomings". One problem Andersen has with the study is that a lot of the egg-eating people in the study also appeared to be eating much meat and processed meat. "If you're taking a lot of processed meat, it doesn't matter how many eggs you're eating," Andersen said. Also, Andersen said, "The study can only show there is a relation between eggs eating and heart disease. But it cannot prove eggs are the cause of the disease. It may just be that people eating a lot of eggs are also taking a lot of bacon."3. (2020高二下·順德期中) 閱讀理解     Windbreaks are barriers formed by trees and other plants. Farmers plant these barriers around their fields, which help prevent the loss of soil and stop the wind from blowing soil away. They also keep the wind from damaging or destroying crops. Besides, extra trees and plants can be cut down and used or sold for wood. Windbreaks can be highly valuable for protecting grain crops. For example, in parts of West Africa grain harvests were twenty percent higher in fields protected by windbreaks compared to fields without them.     But here is something interesting about windbreaks. They seem to work best when they allow some wind to pass through the barrier of trees or plants around the field. If not, then the movement of the air close to the ground will lift the soil. Then the soil will be blown away. For this reason, a windbreak works best if it contains only 60 to 80 percent of the trees and plants that would be needed to make a solid line. An easy rule to remember is that windbreaks can protect areas up to 10 times the height of the tallest trees in the windbreak.     There should be at least two lines in each windbreak. One line should be large trees. The second line, right next to it, can be shorter trees or other plants with leaves. Locally grown trees and plants are considered the best choices for windbreaks. Trees reduce the damaging effects of wind and rain. Their roots help protect soil from being washed away. And trees can provide animals outdoors with shade from the sun.

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