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【单选题】
It seemed that ______.A.
the old man could eat only a little food
B.
the old man could eat a lot
C.
the old man ate little because of his old age
D.
the old man ate little because of seasickness
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举一反三
【单选题】鼻饲插管过程中,病人发生呛咳,呼吸困难时应
A.
嘱病人作深呼吸
B.
将病人头部抬高
C.
立即拔出胃管
D.
停止片刻，嘱深呼吸，再轻轻插入
E.
指导病人做吞咽动作
【多选题】Metal ions as enzyme cofactors, their role is( )
A.
As a component of the enzyme active center, transfer electrons
B.
As a bridge connecting substrates and enzyme molecules
C.
Positive synergy
D.
Stabilizing enzyme molecular conformation
E.
Promoting the formation of covalent compounds between the substrate and the enzyme molecule
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