题目内容：

    While the human world is suffering from the novel coronavirus outbreak, our planet is actually showing certain signs of “recovery” from the damage caused by human activity. According to the BBC, new satellite images released by the European Space Agency showed that levels of air pollutants and greenhouse gases have “fallen sharply” in major cities in Europe and the United States ever since the lockdown started.

This is what happened after recent discoveries in Antarctica. An international team of 89 scientists found that the ice in Greenland and Antarctica is melting six times faster in the 2010s than it was in the 1990s. And in February, Argentina’s Marambio research station in Antarctica recorded a record high temperature of 20.75 ℃ on the continent.

So what exactly will happen if the temperature keeps rising and the ice keeps melting? A third study might give you an idea. A team of scientists drilled a hole into the seafloor in west Antarctica and extracted (提取) material from underground, in which they found traces of roots, spores and pollen—typical products of a rainforest—that dated back 90 million years ago. In other words, Antarctica was very likely a rainforest back when the dinosaurs walked on Earth. But given the fact that the South Pole has four months of darkness during winter—even millions of years ago—scientists believe that the rainforest could only exist if the greenhouse gas concentrations were extremely high back then to keep the continent warm when there was little or no sunlight.

“We didn’t know that this Cretaceous (白垩纪的) greenhouse climate was that extreme,” Johann Klages of the Alfred Wegener Institute in Germany and a co-author of the research told the Guardian. “It shows us what carbon dioxide is able to do.”

Ice or no ice, Antarctica will be—and has always been—fine with extreme changes. The human world, however, may not be.

Now, during the coronavirus lockdown, we’ve seen the changes resulting from less human activity. Hopefully, we’ll hold on to those changes—not for Antarctica or the planet, but for ourselves.

1.What does Paragraph 1 mainly tell us?

A.Our planet is returning to its original state due to the novel coronavirus outbreak.

B.The lockdown of major cities contributed to the decrease of greenhouse gases.

C.The novel coronavirus has a positive effect on the human beings.

D.The novel coronavirus outbreak resulted from human activity.

2.What do we learn from the third study?

A.Typical products of a rainforest were dug out in Antarctica.

B.Traces of dinosaurs living in rainforests were spotted in Antarctica.

C.There was a good possibility of high greenhouse gas concentrations in Antarctica.

D.There used to be enough sunlight for the rainforest in the Cretaceous Antarctica.

3.Which of the following statements is true according to the passage?

A.Human activity doesn’t threaten life in Antarctica.

B.The ice in Antarctica is melting faster in the 2010s than now.

C.We should reduce carbon dioxide emissions for our own sake.

D.The lockdown can be carried on to slow down global warming.

4.What is the main purpose of the passage?

A.To encourage us to defeat the novel coronavirus.

B.To explain the effects of greenhouse gases.

C.To draw our attention to ecosystem in Antarctica.

D.To call on us to reduce human impact on the environment.