1 . Burning coal to provide energy adds planet-warming carbon dioxide, or CO₂, to Earth’s atmosphere. As the planet heats up, experts warn that simply cutting greenhouse gas emissions (排放) will not be enough to avoid possibly disastrous levels of global warming. CO₂ must also be obliterated from the atmosphere, they say.

Existing experimental machines that remove CO₂ directly from the air are too costly to be widely used. But a new report from the U.S. National Academy of Sciences, Engineering and Medicine says effective carbon-removal technology already exists. It is not costly, or even complex science. It’s forests.

The report explains that planting trees and overseeing forests are cost-effective ways to clean the air. They also work well across large areas. Forests used to cover much of the Appalachian Mountains in the eastern United States. In the state of West Virginia, a kind of mining known as strip mining (露天开采) left the land there bare, without trees. Now experts are working to bring back the forests that once covered much of the state.

West Virginia’s Monongahela National Forest is home to a rare group of trees. They are called virgin (原始的) woods; they have never been touched by humans. Shane Jones, a biologist with the U.S. Forest Service, says the trees there were missed by mistake when the surrounding forest was cut down for wood many years ago. That mistake turned out to be a good thing; red spruce (云杉) forests such as those in the Monongahela are extremely effective at taking CO₂ out of the atmosphere and locking it into the soil.

Experts say, nature offers powerful tools to fight climate change.

1. What does the underlined word “obliterated” mean in Paragraph 1?

A．Prevented.	B．Cleared.
C．Produced.	D．Stored.

2. What’s the advantage of forests compared with the existing experimental machines?

A．They release more oxygen.

B．They clear more CO2.

C．They save more money.

D．They absorb CO2 faster.

3. Why does the author mention West Virginia in Paragraph 3?

A．To prove the place is unsuitable for human survival.

B．To stress planting trees is practical for clean air.

C．To indicate trees are difficult to live on such poor soil.

D．To show people in the state are now living a hard life.

4. What can we know about the red spruce trees?

A．They can only be found in Monongahela National Forest.

B．They were given the name virgin woods for beauty.

C．They were cut down for wood by farmers.

D．They could store carbon dioxide in the soil.

2 . Let's take a minute to think about the water we use. The human body is 60% water and we need to drink lots of water to be healthy. When we are thirsty we just go to the kitchen and fill a glass with clean water.

    1    For example, farmers, who produce the food we eat, use water to make the plants grow. When we turn on a light or switch on a TV or a computer we use energy and we need water to produce this energy.

The truth is that we are lucky enough to have clean water whenever we want，but this is not the case for many people around the world.    2    That's around one in 10 people in the world. If we drink dirty water，we can catch diseases from the bacteria and become ill. Every year over 500，000 children die from diarrhea(腹泻)from dirty water. That's around 1，400 children every day！Also，in some countries children walk many kilometres every day to get water.    3    Therefore，they don't have time to learn how to read or write and don't get an education.

    4    On this day every year，countries around the world hold events to educate people about the problems of dirty water and that clean water is something that everyone should have around the world. At one school in the UK，children between the ages of 10 and 15 walk 6km with six litres of water.    5    People give them money to do this and all the money helps get clean water to as many people as possible around the world.

A．We use water indirectly too.

B．Every system in our body depends on water to function.

C．It is to inspire people to learn more about water-related problems

D．If children walk many hours a day to get water，they can't go to school.

E．Did you know that around 750 million people do not have clean water to drink？

F．In 1993 the United Nations decided that March 22nd is the World Day for Water.

G．In this way，they know how it feels to walk a long distance carrying heavy bottles.

3 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Every Wednesday at 7 pm, a group of running enthusiasts from different countries gather at a bar in Shanghai before setting     1     on their 5-kilometer run. But this is no ordinary run. These people     2     (arm) with trash (垃圾) bags. The members of this group don’t simply run for the sake of good health. They do it for the sake of the Earth     3    well.

Called “plogging”, this new fitness activity originated in Sweden in 2016 and was introduced to Shanghai in 2018. The term is a combination of the words “jogging” and “plocka upp”,     4     means “pick up” in Swedish.

By the summer of 2018, just a few months after Trash Running China was founded,     5     (it) WeChat group had grown to include more than 400 runners. To make the activity more fun for both     6     (newcomer) and regular ploggers, Trash Running China also     7     (frequent) organizes longer weekend runs in the suburban areas. “We want more people to hold small ‘plogging’ groups and have a     8     (responsible) to organize trash running activities in their own neighborhoods,” says Eisenring, who founded Trash Running China. “ ‘Plogging’ is a way     9     (know) the people and the city a bit more,” says Robbin Trebbe, one of the     10     (late) runners to join the group.