单项选择题

______ is the key word in the treatment of eye problems.

A．Chemical bums
B．Victim
C．Urgency
D．Physician
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单项选择题
What’s the difference between the two phases of experiments
A．The two kinds of vaccines were vaccinated together on volunteers in the first phase.
B．The two kinds of vaccines will be vaccinated together on volunteers in the second phase.
C．The combined safety of vaccines had been tested in the first phase.
D．The safety of each vaccine will be tested in the second phase.
单项选择题
When a person practicing a particular yoga exercise has stretched his body to the point where it begins to hurt, he should______
A．begin breathing through the nostrils
B．slow down somewhat, but continue straining
C．stop the particular exercise at once
D．close his mouth immediately
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