問題詳情

請依下文回答第 46 題至第 50 題     These satellite images show the ebb and flow of plant life on earth over three years, taken by a NASA satellitecalled SeaWiFS. The blue areas are void of plants, the red spots indicate an overabundance, and the green areas showwhere plants are thriving. This is the earth breathing. The plants are taking up CO2, and they’re breathing out oxygen.As suggested by oceanographers, almost half of that activity is going on underwater. The oceans are teeming withtiny microscopic plants called phytoplankton. They are at the bottom of the food chain, and they basically feed all sealife. Like all plants, phytoplankton absorbs CO2 from the atmosphere.     These images show that phytoplankton boomed over the last three years. That’s one of the key benefits of thesesatellite images. Over time, scientists will use them to help predict how plants might respond as we burn more fossilfuels, and as global CO2 levels rise. Many scientists think such greenhouse gasses will cause global warming. Theysuggest that it is related to recent climate change. However, what they don’t know is how life in the ocean will respondover the long haul if CO2 levels keep rising.
46 What is the main idea of the whole text?
(A) Satellite images of the ebb and flow of plant life show the earth breathing.
(B) Satellite images show that phytoplankton absorbs CO2 from the atmosphere like other plants on earth.
(C) Satellite images will prove to us that plant life in the ocean causes rising CO2 levels and global warming.
(D) Satellite images of plant life activities can help predict how plants will respond to rising CO2 levels.

參考答案

答案：D
難度：適中0.49
統計：A(17),B(17),C(13),D(49),E(0)

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