The use of Chinese by teachers in ______ English classroom must be restricted because it will decrease _______ time when students are exposed to the English language.

A．the; /

B．an; /

C．/; the

D．an; the

急性心肌梗死时，哪种情况不能转院

A．血压正常

B．心律失常已控制

C．疼痛已缓解

D．发病在4小时以内

E．心功能尚好