In Following questions the 1st 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 Rand S. These four parts are not given in their proper order. Read the sentences and find out which of the four combinations is correct:
1. Advocates of space programme argue for spending huge amounts of money on exploring Mars.
P. But there is no firm evidence of any valuable mineral that can be extracted from Mars. and transported to Earth.
Q. Worst, nobody has any idea what undesirable microbes or poisonous materials we will be importing from Mars.
R. They are also unrealistic about the cost of transportation that will be involved in interplanetary movement of men and materials.
S. These enthusiasts argue that Mars could be a perennial source of materials for us earthlings.
6. Our race to Mars is likely to be a wild goose chase:
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