【单选题】It can be seen from the passage that the earth's supply of natural medicines
A.
may never be exhausted.
B.
may be dropping rapidly.
【判断题】津主要布散于体表皮肤、肌肉和孔窍等部位,并渗入血脉;而液主要灌注于骨节、脏腑、脑、髓等组织。
【单选题】They often() the scientist’s name, but they have never seen him.
【单选题】She’s never seen such a wonderful film, _______ she?