A.birth | B.evidence | C.existence | D.occurrence |
A.existence | B.occurrence | C.evidence | D.birth |
A. created B. single C. sure D. attraction E. evidence F. free G. ceiling H. birth I. led J. closed K. series |
Carlsbad Caverns National Park contains more than 100 caves below the surface of the desert. Most are
An elevator lowers you into the world of Carlsbad Cavern. It is really long
The Big Room and other parts of the cavern contain huge, sharp formations of minerals. People are
Stalactites(钟乳石)hang from the
One of the first questions that visitors have is 'how did Carlsbad Cavern form? ' Guides explain that it did not result from the action of water and streams like other limestone caves. Instead, it was
People are not the only ones who visit Carlsbad Caverns National Park. About 400,000 Mexican free-tailed bats come to the big cave from Mexico each summer to give
It is easy to imagine that it was the bats that