题目内容：

    One of the most critical roles forests play is relieving climate change. Trees suck enormous amounts of carbon dioxide out of the air and fix the carbon in their wood and the soil. A recent study found that planting new trees over an area the size of the US could suck away two thirds of all the carbon dioxide discharge that humans have pumped into the atmosphere.

“Without animals, it is harder for forests to absorb carbon, as tree species (种类) important for protecting the climate could be lost without animals", Susanne Winter, a program director said at the WWF.

In Africa, many of the tree species that absorb the most carbon rely on large birds and primates (灵长类动物) to eat their fruits and spread their large seeds, according to the report. Without them, those trees would have difficulty reproducing and forests would lose their best carbon-storing trees.

“Forests are our greatest natural ally in the fight against global warming, ”Winter said.“If we want to hold back the worldwide decline in biodiversity and prevent the climate crisis,s we need to protect the forests and the species living there.

Forests also filter (过滤) water-- as water makes its way to lakes or groundwater reserves, the roots and soil separate it from deposits and pollution that it collects along the way. What' s more, forests regulate the global water cycle, since trees' leaves, branches, and roots store or send out water vapor.

Climate models show that forest-cutting down in Central Africa could lead to a 15% drop in rainfall in the US Midwest, and Amazon deforestation (森林滥伐) could cut Texas rainfall by 25%.

Humans also get food, wood, and medicine from the abundance of plants and animals in forests. Worldwide, 1.6 billion people rely on forests for their livings, according to the United Nations. About 300 million people live in forests, according to WWF.

1.What's the purpose of Paragraph 3?

A.To tell where the large seeds go.

B.To show the tree species in Africa.

C.To draw reader' s attention to Africa.

D.To support Susanne Winter’s opinion.

2.What does the underlined word“ally" in Paragraph 4 probably mean?

A.Winner.

B.Competitor.

C.Partner.

D.Victim.

3.How do forests change climate according to the passage?

A.By affecting air and water.

B.By feeding birds and animals.

C.By providing life necessities.

D.By increasing the variety of trees.

4.What can be inferred from the passage?

A.Water should be filtered.

B.The more forests, the more rain.

C.Forests should be globally protected.

D.Half the carbon dioxide is sucked away by trees.