Question

Because of ________ high demand for Type AB blood, ________ supplies of it are usually limited.

A．the; the	B．不填；不填
C．不填；the	D．a; the

Answer 1

D

D 考察冠词。句义：由于对AB血型血液的高需求，它的供应受到限制。第一空表示泛指，第二空特指AB型血型的供应。