完形填空。阅读下面短文，从短文后所给各题四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
In 1982, Steven Callahan was crossing the Atlantic alone in his sailboat when it struck something and sank．He got into a life boat, but his supplies were 41 ．His chances of surviving were small． 42 when three fishermen found him 76 days later, he was alive —much 43 ． than he was when he started, but alive
His 44 ．His cleverness —how he 45 （蒸发） sea water to 46 fresh water—is very interesting． to catch fish, how he evaporated of how he survived is fascinating
