题目

Even if you’ve never been to Phoenix in Arizona, you probably know this about the place: its terrible _____. From June to September, the temperature can easily climb up to an unbearable point. But that doesn’t _____ hikers from attempting the 1.3-mile hard walk to the top of the city’s famous Camelback Mountain. Signs _____ that the trail is extremely difficult. If you continue, a posted checklist suggests at least a liter of water per person. And _____you’re still not stopped, another _____ farther up declares: “If you’re halfway through your water, turn around!”_____ many peopl如图所示，人在岸上用轻绳拉船，若人匀速行进，则船将做（　　）   A．匀速运动                             B．匀加速运动 C．变加速运动                           D．减速运动