OG1 阅读 Q46

Choice C is the best answer. Lines 29-30("In... commodity.") introduce the idea that water mined in space may be very valuable: "water mined from other worlds could become the most desired commodity." Lines 35-40("Water... stations.") support this assertion by suggesting how mined space water could be used "for drinking or as a radia-tion shield" (lines 36-37,"astronauts on ... as a radiation shield.") or to make "spacecraft fuel" (line 38, "oxygen... fuel,").
Choice A is incorrect because the comparison in the previous paragraph (the relative value of gold and water to someone in the desert) is not expanded upon in lines 35-40("Water... stations.") . Choice B is incorrect because the question asked in the previous paragraph is also answered in that paragraph. Choice D is incorrect because no specific proposals are made in the previous paragraph; rather, an assertion is made and a question is posed.