题目内容
（请给出正确答案）
Certain pine trees are deliberately dwarfed for______ purposes.
A．constructive
B．dimensions
C．ornamental
D．decorated
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听力原文： American researchers say cutting down trees in snow regions might help counter the effects of global warming. The findings highlight the complexity of the planet as it'd previously been understood that mass deforestation contributed to global warming. It's been a woe cry for environmentalists in recent years "Mass deforestation contributes to global warming." But that argument may now have to be revised. Scientists in the United States have run a simulation of the effects of large-scale clearing. And they find that if trees were to be cut down in the icy northern regions, it would actually cool down the Earth. The reason: snow reflects sunlight and the great pine forests of Russia, Europe and Canada shade tens of thousands of hectares of reflective snow.
What might help control global warming according to American researchers？
A．Planting more trees.
B．Cutting down trees in snow regions.
C．Melting snow.
D．Growing flowers of a certain species.
A、Pine, bamboo and plum trees
B、Plum, bamboo and willow trees
C、Willow, bamboo and Chinese parasol trees
D、Pine, plum and maple trees
What does the author think about the genetic engineering of pine trees？
A．Time-consuming.
B．Worthwhile.
C．Significant.
D．Technically impossible.
A．require
B．requires
C．is required
D．that requires
A、Emmenopterys henryi
B、ginkgo
C、Chinese dove trees
D、dawn redwood
E、pine tree
A．tenderly
B．tenuously
C．tentatively
D．tenaciously
A.Multiple Ravins and Pines under the Wind
B.Wind Map of Wanhe Pines
C.Valleys and Pine Trees in the Wind
D.Windy pines Among a Myriad Valleys
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