Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
Climate change is caused by the (1)____________ high levels of dangerous chemicals in the atmosphere, particularly carbon dioxide. It is estimated that average global temperatures will rise (2)___________ between two and six degrees by the end of this century. We all know the effects could be catastrophic, but are we (3)__________ of the possible solutions? Crazy as it sounds, a group of academics from British universities is making a plan to build a 12-mile pipe, held up by a huge balloon, that would pump (4)___________ quantities of toxic chemicals, such as sulphur dioxide, into the atmosphere. Surprisingly, there is good science behind the idea. The chemicals would form a (5)_____________ layer around the earth that would reflect sunlight and so cool the earth, much like the effects of a volcanic eruption

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