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【单选题】
胸外心脏按压方法中不正确的做法是( )A.
按压部位在胸骨下1/2处
B.
使胸骨下陷3～4cm
C.
胸外按压频率100/min
D.
双人操作，每按压5次，吹气1次
E.
不论单人或双人操作，每按压15次，吹气2次
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举一反三
【单选题】-- Be careful as you step down. -- __________.
A.
Thank you.
B.
That’s very kind of you.
C.
Sorry.
D.
I don’t know.
【单选题】As an engineer, you can't be careful. You should pay attention to every detail.
A.
very
B.
too
C.
so
D.
quite
【单选题】Be careful when you deal with this chemical, as it will explode when _____ to sunlight. [ ]
A.
being exposed
B.
to expose
C.
exposing
D.
exposed
【单选题】Be careful when you watch the painting as it is______.
A.
valueless
B.
priceless
C.
costless
D.
worthless
【单选题】Be careful when you deal with this chemical, as it will explode when ______ to sunlight.
A.
exposed
B.
to expose
C.
exposing
D.
being exposed
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