Itseemsasifthesun_____roundtheearthsinceitrisesintheeastandsetsinthewest.
A、circles
B、iscircling
C、hasbeencircling
D、werecircling
低氧性呼吸衰竭是指在排除发绀型心脏病的前提下，患儿在吸入氧浓度大于_______%时，动脉氧分压小于_______mmHg。
Thereisn‘tmuchmilk_____isleftinthebottle.
A、what
B、which
C、whatever
D、that
A、＜1岁
B、1～1．5岁
C、2～2．5岁
D、＞3岁
Iknowmylimitations,soIwon’tdoanything______myability.
A、beyond
B、under
C、above
D、below