23. Lone Star geyser trail is one of the easiest five mile roundtrip hikes in Yellowstone. This mostly _______ trail follows an old service road along the Firehole River through unburned forests of lodgepole pine. Lone Star geyser erupts approximately every three hours, and is a crowd pleaser. This trail can also be accessed by bicycle with the final approach to the geyser _______ foot.
(A) flat; in
(B) rocky; by
(C) level; on
(D) bumpy; off
阿摩線上測驗
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