問題詳情

Approximately, 260 volunteers contribute 50,000 hours of work every year in the National Park. Whether working at visitor centers and campgrounds or 31 backcountry trails, volunteers protect valuable resources and help visitors learn about, and more safely enjoy, the National Park. While you might not 32 volunteer contributions at first, look around and you will be 33 at how many volunteers you see. It is primarily volunteers 34 provide visitor information at campgrounds, and at the visitor centers in the park. They keep the campsites, backcountry roads, and trails in pristine condition, assist with maintenance projects, and 35 considered the eyes and ears of the park. Please thank them for their services if you have the opportunity.
31.
(A) patrolling
(B) patrols
(C) patrolled
(D) patrolˉ

參考答案

答案：A
難度：適中0.4
統計：A(168),B(122),C(79),D(35),E(0)

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