TOEFL Reading: ETS-TOEFL阅读机经 - 8EYS3IP519SBL5T8L$

According to paragraph 1, all of the following are true of atolls EXCEPT A. Most atolls occur in the Indo-Pacific area. B. Atolls occur only in very deep waters. C. Atolls are more common than other types of reefs. D. Atolls occur far from a landmass.