题目

The Water Angel（天使）From June to September, the temperature in Phoenix is so high that it can easily hit the century mark. But that doesn't stop hikers（徒步旅行者）from _________ the 1.3-mile hike to the top of the city's famous Camelback Mountain. _________ warn that the path is extremely difficult. If you continue, _________ a liter（升）of water per person is _________ . And another sign farther up declares: If you're halfway _________ your water, turn around!Unfortunately, many people _________ the warnings. _________, Scott Cullymore doesn't. When he's not working, the Let’s chess after school .A. play B. to play C. playing D. plays.