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题型:阅读理解-阅读单选 难度:0.65 引用次数:42 题号:10804878

Compared to other causes of natural disasters, volcanoes offer clues only when they are about to erupt. Now, however, developments in monitoring systems have allowed scientists to develop sensors to detect and forecast eruptions more accurately.

University of Cambridge volcanologist Marie Edmonds says that scientists are now able to use very accurate sensors to monitor the gases volcanoes give out, which can give clues on the location of the magma. The sensors help with prediction because different gases are released at different stages of an eruption. When magma rises, pressure is released along with gases. Carbon dioxide is released early on and then, as the magma goes higher, Sulphur dioxide is released. The ratio of the two gases is used to detect the location of magma relative to the surface, telling researchers the coming of the eruption.

Edmonds is connected to an international group known as the Deep Carbon Observatory that has worked to put new gas sensors on fifteen of the most active and dangerous volcanoes to improve the forecasting of various types of eruptions. The gas sensors continually measure water vapor, sulphur dioxide, and carbon dioxide. They are placed inside large boxes with surface antennae and buried underground. Advances in electronics have increased their accuracy and lowered their cost, allowing more of them to be used worldwide.

Putting these sensors atop active volcanoes is dangerous. Scientists wear reflective suits that protect against heat, plus gas masks for protection from dangerous gases. They sometimes hike long distances in remote areas to reach a site. However, according to Edmonds, the work they do to save people’s lives makes a dangerous job worth it. She enjoys doing something that helps people.

Edmonds’ team has also attached sensors to a certain plane to measure gases released from a Papua New Guinea volcano for a short time, a technique developed to gather “snapshots” of the activity. These snapshots help researchers to better understand activities that lead to eruptions.

1. How do sensors detect and predict volcanic eruptions?
A.By sending warnings to researchers.B.By testing different gases released.
C.By measuring the heat underground.D.By studying the surrounding gases.
2. What do we know about the gas sensors?
A.They should be attached to the magma.B.They are available around the world.
C.They become more accurate and expensive.D.They can check various types of eruptions.
3. Why is it risky to place sensors atop active volcanoes?
A.Active volcanoes may erupt at any time.B.It’s hard to find the top of volcanoes.
C.Scientists are short of enough suits and masks.D.There is heat and dangerous gases
4. What can the snapshots do?
A.Predict volcanic eruptions earlier.B.Attract people’s attention to volcanoes.
C.Collect more information for researchersD.Avoid the danger of the researchers’ work.

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【推荐1】For decades, climate scientists have named hurricanes and ranked them according to the damage. “Naming and categorizing (把……归类) heat waves is also a must,” states a newly formed international union, called the Extreme Heat Resilience Alliance. “Hurricanes get attention because they cause obvious physical damage,” says Jennifer Marlon, a climate scientist at Yale University. Heat waves, however, have less evident effects, since the primary damage is to human health.

Heat waves kill more people in the United States than any other weather-related disaster. Data from the National Weather Service show that from 1986 to 2019, there were 4,257 deaths as a result of heat. By comparison, there were fewer deaths by floods (2,907), tornadoes (2,203) or hurricanes (1,405) over the same period. What’s more, climate change is increasing the possibility of high temperature events worldwide, getting tens of thousands of people dying each year because of heat.

Some populations are particularly easily harmed by high heat, including people over 65 and those with potential medical conditions. Historical racial discrimination also puts minority communities at higher risk. Due to housing policies, they are more likely to live in urban areas, heat islands which lack green spaces that help cool down neighborhoods.

Part of the naming and ranking process will include defining exactly what a heat wave is. No single definition currently exists. Without a universally accepted definition of a heat wave, “We don’t have a common understanding of the danger we face,” says Aaron Bernstein, an expert of the new group. “Defined categories for heat waves could help local officials better prepare to deal with potential health problems in the face of rising temperatures. And naming and categorizing heat waves could increase public awareness of the health risks caused by these silent killers.”

The union is having conversations with the National Oceanic and Atmospheric Administration, the World Meteorological Organization and other institutions to develop a standard naming and ranking practice.

1. What do we know about the heat wave in America?
A.It causes most serious physical damage.
B.It has got more attention in recent years.
C.It kills more people than other natural disasters.
D.It is the biggest killer among weather-related disasters.
2. Why are minority populations easily harmed by heat waves?
A.They live in poorly-built houses.B.They lack good medical resources.
C.They have less access to green spaces.D.They are limited in their movements.
3. What is the author’s attitude towards the expert mentioned in Paragraph 4?
A.Supportive.B.Negative.
C.Conservative (保守的).D.Objective.
4. What does the text intend to tell us about heat waves?
A.They also kill lives like hurricanes.B.They should have names like hurricanes.
C.Climate change is affecting them greatly.D.Measures should be taken to prevent them.
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【推荐2】Wildfires were rapidly spreading through northern and southern California as powerful winds swept through the state, burning homes and forcing more than 200,000 people to leave their homes. Thousands of structures were destroyed in the massive fires. Firefighters and volunteers worked around the clock, risking their lives to save others, although thick clouds of wildfire smoke hung in the air.

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