Mass coral 34 , a global problem triggered by global warming, 35when coral polyps expel colorful algae, causing the coast barrier and skeletal. The algaeprovide up 90 percent of the coral’s energy and the effect leaves the coral to 36 .The Great Barrier Reef illustrates how extensive the damage can be. Thirty percent ofthe coral perished in 2016 and twenty percent in 2017. The situation is 37 to aforest after a 38 fire. Much of the marine ecosystem along the reef’s north coasthas with little hope of recovery.
34.
(A) banishment
(B) bleaching
(C) recession
(D) deterioration