皮皮学，免费搜题
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【多选题】
下列有关呼吸的描述错误的是:A.
呼吸与脉搏的比例为1:4
B.
男性呼吸比女性快.
C.
男性及儿童以胸式呼吸为主,女性以腹式呼吸为主
D.
低温环境可使呼吸增快
E.
呼吸不受意识控制
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皮皮学刷刷变学霸
举一反三
【单选题】A new technique_________, the yields as a whole increased by 20 percent.
A.
working out
B.
having worked out
C.
having been worked out
D.
to have been worked out
【单选题】________hard before, Tom is afraid of failing in the exam.
A.
Having been worked
B.
Not to have worked
C.
Having never worked
D.
Never have worked
【单选题】_______ , the girl worked in a hurry.
A.
Having swept the room
B.
Another room swept
C.
Having another room to sweep
D.
Having another room to be swept
【单选题】1 spent half an hour _________ this difficult math problem.
A.
having worked on
B.
to work on
C.
on work
D.
working on
【单选题】________ in the company for three years, Mark has become experienced in business negotiations. A) Having worked B) Have been working C) Have worked D) Worked
A.
Having worked
B.
Have been working
C.
Have worked
D.
Worked
【单选题】all day, I went to bed early.
A.
Working hard
B.
Worked hard
C.
Having worked hard
D.
To work hard
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