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题型:阅读理解-阅读单选 难度:0.65 引用次数:51 题号:22430209

When lightning caused fires around California’s Big Basin Redwoods State Park north of Santa Cruz in August 2020, the fire spread quickly. Mild fires strike coastal redwood (红杉) forests about every decade. The giant trees resist burning thanks to the bark (树皮), up to about 30 centimetres thick at the base, which contains acids. Their branches and needles are normally beyond the reach of flames. But this time flames shot through the top of 100-metre-tall trees, burning the needles. “It was shocking,” says Drew Peltier, a tree expert at Northern Arizona University. “It really seemed like most of the trees were going to die.”

Yet many of them lived. In a paper published yesterday in Nature Plants, Peltier and his colleagues help explain why: The survivors use long-held energy reserves—sugars that had been made from sunlight decades earlier—and poured them into buds (芽) that had been lying dormant (休眠的) under the bar k for centuries.

“This is one of those papers that challenges our previous knowledge on tree growth,” says Adrian Rocha, an ecosystem ecologist at the University of Notre Dame. “It is amazing to learn that carbon taken up decades ago can be used to sustain its growth into the future.” The findings suggest redwoods have the tools to cope with big fires driven by climate change, Rocha says. Still, it’s unclear whether the trees could cope with the regular infernos that might occur under a warmer climate environment.

The fire in 2020 was so intense that even the top branches of many trees burned and their ability to photosynthesize (光合作用) went up in smoke along with their pine needles. Trees photosynthesize to create sugars and other carbohydrates (碳水化合物), which provide the energy they need to grow and repair tissue. Trees do store some of this energy, which they can call on during a drought or after a fire. Although the redwoods have sprouted (长出) new growth, Peltier and other forest experts wonder how the trees will cope with far less energy from photosynthesis, given that it will be years before they grow as many needles as they had before the fire. “They’re alive, but I would be a little concerned for them in the future.”

1. What’s special about this big fire for coastal redwood forests in 2020?
A.It burnt the top of the trees.B.It was very close to the last fire.
C.It resisted burning effectively.D.It caused relatively minor damage.
2. Why did redwoods survive in the big fire?
A.Sugars protected their barks.B.Energy reserves promoted the growth of buds.
C.They got used to hot climate.D.They took in much carbon to resist fire.
3. What does the underlined word “infernos” in the third paragraph mean?
A.Unpredictable disasters.B.Changeable climate.
C.Terrible environment.D.Uncontrollable fires.
4. Why does Peltier worry about the survival of redwoods?
A.Their tissues can’t be repaired.B.They can’t save energy anymore.
C.Their energy saved is not sufficient.D.They grow too slowly.
【知识点】 环境保护 说明文 植物

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【推荐1】There are plenty of things you can do to live a greener life, through your day-to-day activities, and most of these apply to anyone.

Save energy. The most effective way to cut down on your carbon emissions (排放) is to save energy in your home. Use energy-efficient light bulbs, turn lights off when they aren’t in use, make sure windows are fully closed, and try to reduce the use of your energy.     1    .

Protect water. Every drop of tap water you use consumes (消耗) energy. Remember, it needs several processes before it reaches your tap. It might just be water, but a lot of fossil fuel is used for processing it.     2    . You can turn the tap off while brushing your teeth, switch to more efficient washers and dryers and collect rainwater for use in your garden.

    3    . If a hybrid car (混合动力车) is not an option at the moment, you can choose other ways. Walk or bike whenever you have to travel a short distance. If you want to have long trips or your work place is too far consider using public transport. You can also take a car with friends or coworkers if that works.

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【推荐2】Every week, Angela looked at her recycling bin, filled with shampoo bottles and plastic containers, with mixed feelings. Sure, it was a lot of plastic, but it was going to be recycled. Or so she thought. Then, her husband sent her some articles revealing that less than 6% of the country’s plastic gets recycled. She was shocked.

Determined to cut back on her plastic consumption, Angela got a starter kit from a company selling refillable household cleaners (家用清洁器). In it were tablets, containing concentrated hand soap as well as glass and bathroom cleaners, and four empty containers. She filled each one with tap water, then dropped in a tablet and watched it dissolve. If she was happy with the cleaners, she would order more tablets but reuse the containers. No new plastic required.

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