In the following questions, the lst and the last sentences of the passage are numbered 1 and 6. The rest of the passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence and find out which of the four combinations is correct. Then find the correct answer.
1. Carl Sagan
P. the severity of the problem
Q. says that we do notfully understand
R. that the next generations may be badly affected
S. in his essay
6. and that the only solution is international co-operation.
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