18．Questions 14 through 16 are based on the following passage．
14．A．Mountain climbers are risking lives．
B．Both young and old climbers take part in mountaineering．
C．Mountaineering doesn't have man-made rules．
D．Mountaineering is forbidden in some countries．
15．A．Mountaineering is more dangerous than other forms of sports．
B．Mountaineering doesn't call for team efforts．
C．Mountaineering is attractive to people．
D．Mountain climbers often fall from the rocks and die．
16．A．Because they have more teammates．
B．Because mountaineering doesn't need much strength．
C．Because they face less natural forces．
D．Because they are more skillful．
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