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[2020·桂林市、崇左市联合模拟考试]The world is a greener place than it was 20 years ago. A study published in the journal Nature Sustainability said that recent satellite data reveals a greening pattern that is prominent (显著的) in China and India. The study shows that human activity in China and India dominates this greening of the planet, thanks to tree planting and agriculture. The effect comes mostly from ambitious treeplanting programs in China and intensive agriculture in both countries.
“China and India account for onethird of the greening，” said lead author Chi Chen of Boston University. “That is a surprising finding, considering the vague idea of land degradation (毁坏) in populous countries from overexploitation，” added Chen.
China alone accounts for 25 percent of the global net increase in leaf area with only 6.6 percent of global vegetated area. The greening in China is from forests (42 percent) and croplands(32 percent), but in India, it is mostly from croplands (82 percent) with the minor contribution from forests (4.4 percent)．
China's outsized contribution to the global greening trend comes in large part from its programs to conserve and expand forests with the goal of preventing land degradation, air pollution, and climate change.
“Once people realize there is a problem, they tend to fix it，” said Rama Nemani, research scientist and coauthor of the study. “In the 1970s and 80s in India and China, the situation around vegetation loss was not good. In the 1990s, people realized it, and today things have improved. Now we see that humans are contributing.”
Land area used to grow crops is comparable in China and India — more than 770,000 square miles — and has not changed much since the early 2000s. Yet these regions have greatly increased both their annual total green leaf area and their food production.
This was achieved through multiple cropping practices, where a field is replanted to produce another harvest several times a year. Production of grains, vegetables, fruits and more has increased by about 35%～40% since 2 000 to feed their large populations.
1．What did the study mainly find?
A．India and China are leading the global greening effort.
B．Intensive agriculture is the cause of global land degradation.
C．China and India has got the largest forest coverage in the world.
D．Agriculture is more helpful in expanding green areas than treeplanting.
2．How is China different from India in contributing to the global greening?
A．India reduced croplands to prevent the overexploitation.
B．India increased forest by planting around croplands.
C．China changed more lands into forest by planting trees.
D．China controlled the increase of its population.
3．What does Nemani think about humans in China and India in protecting the Earth?
A．Ambitious. B．Responsible.
C．Passionate. D．Tolerant.
4．What does the passage finally suggest humans should make good use of?
A．Forest. B．Trees.
C．Croplands. D．Food.
