题目内容

Lecture 2Question-L2.1

A. To argue that carbon emissions today are not the only factor responsible for global warming
B. To provide evidence that rates of global carbon emissions fluctuate over time
C. To show the importance of distinguishing between different types of carbon emissions
D. To describe different ways carbon is removed from the atmosphere

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Question-L2.2 Click on 2 answers

A. Its vastness
B. Its cold temperatures
C. The absence of life there
D. Its role as the ultimate source of energy on Earth

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Question-L2.3 Click on 2 answers

A. By dissolving it
B. Through a process of condensation and precipitation
C. By storing the remains of marine animals
D. Through the regulation of air temperatures

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Question-L2.4

A. To explain why the price of fossil fuels is continually rising
B. To explain how certain fuel sources can be recovered from the ocean floor
C. To explain why coal and oil are more difficult to obtain than natural gas
D. To explain why fossil fuels contribute to an excess of carbon in the atmosphere

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Question-L2.5

A. It is the fuel source most widely approved by environmentalists today.
B. It is part of a balanced system of carbon emission and absorption.
C. It is circulated throughout the oceans by the movement of ocean water.
D. It readily combines with other carbon molecules to produce long chains.

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