(二)   Madagascar, previously known as the Malagasy Republic, is the fourth biggest island in the world. Its area is slightly bigger than ___26___ of its former colonial ruler. Scientists sometimes call Madagascar the eighth ___27___. This is because a large proportion of the animal and plant life here can’t be found anywhere ___28___.   For example, this massive island ____29___ nine-tenths of the world’s lemurs. Nevertheless, the island's ___30____ ecosystems and unique wildlife are threatened by the rapidly growing human population and environmental pollution.
【題組】26.
(A) it
(B) that
(C) one
(D) some