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Safety goggles should be worn at all times______in testing areas.
A．as
B．while
C．during
D．although
答案
更多“Safety goggles should be worn at all times______in testing areas.A．asB．whileC．duringD．alth”相关的问题
第1题
According to the passage, quad bike riders have to______.
A．take lessons if they use the bike as part of their job
B．wear gloves, helmets, goggles, boots and elbow pads
C．formulate basic safety instructions
D．have a motorbike licence
第2题
As your lab instructor, it is my duty to assist you in setting up your experiments and understanding your results. I will also grade your lab notebooks. But I have an even more basic responsibility: your physical safety. I will insist on proper precautions, such as wearing protective goggles at all times. I also expect you to use common sense: don't wear long scarves that might catch fire; don't smoke; don't taste unknown substances.
Let me reinforce this point with a story. Issac Newton, perhaps the greatest scientist of all ages, lived in a period when the toxic effects of chemicals were less understood than today. He routinely sniffed fumes, tasted chemicals, and used open containers for heating substances. In the early 1690s, he suffered through a period of insomnia, depression, and mental instability. Though his biographers linked this situation to problems in his personal life, researchers now think it was a consequence of his lab procedures; they found abnormally high concentrations of lead, mercury, and other heavy metals in preserved specimens of his hair.
Consequently, we must learn from the past and put safety first.
At what point in the semester does this talk take place？
A．At the beginning.
B．In the middle.
C．Near the end.
D．During the final exam.
第3题
A．He should exercise everyday.
B．He should relax in a chair in the afternoon.
C．He should go on a strict diet.
D．He should get up early in the morning.
第4题
听力原文：Is check ok？
(A) Yes, the condition of this machine is very good.
(B) Yes, we should check if everything is Ok.
(C) Yes, you can use it.
(23)
A．
B．
C．
第5题
Perhapsyou＿＿＿leavenow．Yourfriendmaybewaitingforyououtside．
[A]must
[B]could
[C]should
[D]will
第6题
According to the writer, ______.
A. elderly women should be paid well
B. elderly women should live with their families
C. all people should do something for elderly women
D. housework should not be done by elderly women
第7题
The fifth paragraph warns that the intended reader
A．may not agree with you about who should read your report.
B．may not think that your report is of any value.
C．may not accept a report that is submitted late.
D．may not read through your report in full.
第8题
According to Thomas Insel, "the glass is half empty" suggests that ______.
A．patients should give up treatment
B．patients should stick to treatment
C．there is only half glass of water left
D．efforts should be made to find better treatment in the future
第9题
A．It is quite general.
B．It is closely related with information in newspaper.
C．It should be changed.
D．I'll take a short time to find the relevant materials.
