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【单选题】
下列叙述中，错误的是（ ）A.
肺适于气体交换的结构是肺泡壁只有一层上皮细胞构成的
B.
小肠适于吸收的主要特点，小肠内表面积大，绒毛壁、毛细血管壁都是一层上皮细胞构成的
C.
人体肺循环的过程是右心室→肺动脉→肺部毛细血管→肺静脉→左心房
D.
某人长期只吃鱼、肉、蛋导致牙跟出血的原因是食物中蛋白质过多
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举一反三
【单选题】The only ______ before him which he felt himself to be incapable of contemplating was the prospect of leaving Emily.
A.
outlook
B.
prospect
C.
attitude
D.
view
【单选题】The only ______ before him which he felt himself to be incapable Of contemplating was the prospect of leaving Emily.
A.
outlook
B.
prospect
C.
attitude
D.
view
【单选题】He felt helpless in a situation ______ he could not move himself.
A.
where
B.
which
C.
that
D.
while
【单选题】________ he felt like ________, he reminded himself that he had a family to support.
A.
Every time ; giving up
B.
At one time ; to give up
C.
At a time; gave up
D.
At that time; giving up
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