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. It is useful to distinguish.
P. basic research
Q. pure science, which involves
R. and applied science
S. between two formsof science
6. which involves technology.
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