is not visible
are not invisible
are not visible
can easily be seen
第1题：
A、to
B、by
C、at
D、with
第2题：
When it is necessary to remove a victim from a life threatening situation，the person giving first aid must ().
A.Pull the victim by the feet
B.Avoid subjecting the victim to any unnecessary disturbance
C.Carry the victim to a location where injuries can be assessed
D.Place the victim on a stretcher before attempting removal
第3题：
Uncertainty refers to a situation where:
A the outcomes are known but their probabilities are high
B the outcomes and their probabilities are known
C neither the outcomes nor their probabilities are known
D states of nature can change at any time
E probabilities of various states of nature can change at any time
第4题：
I take the other way to school so as to avoid _____ with him.
A、to meet
B、meeting
C、having meet
D、have met
第5题：
The human can react to any situation, some of which he may never have imagined.()
第6题：
A、should not
B、don't need
C、have not
第7题：
-Can you tell us why you think this makes good business sense to you? -We've been doing quite well on our own and we could probably survive like this for quite a few more years to come, but if we really want to take it to the next level, ____________.
：A the board of directors needn't take the present economic situation into consideration ;
B it's not necessary for us to develop the company any more ;
C we are going to have to consider finding more investors
第8题：
109 Uncertainty refers to a situation where:
A. the outcomes are known but their probabilities are high
B. the outcomes and their probabilities are known
C. neither the outcomes nor their probabilities are known
D. states of nature can change at any time
E. probabilities of various states of nature can change at any time
第9题：
A、make
B、do
C、take
第10题：
A stand-on vessel is ______.
A.required to give way in a crossing situation
B.required to sound the first passing signal in a meeting situation
C.free to maneuver in any crossing or meeting situation as it has the right-of-way
D.required to maintain course and speed in a crossing situation but may take action to avoid collision