|Questions 18～21 are based on the following conversation.
| It was the single, strangely spiraled tusk that
first alerted scientists. Sticking out of the ice covered by Siberian soil, like
an ivory tombstone, it revealed the. presence of a true scientific wonder:
underneath lay the frozen body of a mammoth.
The discovery has presented researchers with an unprecedented challenge--to move to laboratory, a mammoth’s entire, undisturbed body where it can be analyzed at leisure and its biological secrets revealed.
Last week, scientists completed the first stage of this remarkable transfer, using a helicopter to lift a twenty-three-ton block of ice and mammoth to a new site where defrosting can be started.
As one of the team, Dutch paleontologist Dick Mol put it, "It’s very exciting. I’ve been working on mammoths for more than 25 years, and this is a dream for me—to fin
A. A mammoth had a strangely spiraled long nose.
B. A mammoth was like an ivory tombstone.
C. A mammoth stuck out of the Siberian soil.
D. There was a frozen mammoth under the Siberian soil.
Read the following text. Choose the best word(s) for each numbered blank.