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
Not only ____ scientists about weather and growth conditions during their long life but they also offer some insight into the future.
(A) do these ancient pine trees tell (B) these ancient pine trees tell
(C) tell these ancient pine trees (D) did these ancient pine trees tell
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