Question 21: A. Attracting not only tourists but also scientists, the local people can study its complex ecosystems B. This unique region no...

Question 21:

A. Attracting not only tourists but also scientists, the local people can study its complex ecosystems

B. This unique region not only attracts tourists but also scientists who study its complex ecosystems

C. Tourists and scientists study its complex ecosystems so that this region is a unique destination

D. As long as this unique region has complex ecosystems, tourists and scientists are attracted to study it