单项选择题

What is troubling Kerry Packer

A．He did n’ t know who should pay the repair bill.
B．He was accused of improper jet piloting.
C．He was attacked by a kangaroo.
D．His private jet killed a kangaroo.
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单项选择题
______ is the key word in the treatment of eye problems.
A．Chemical bums
B．Victim
C．Urgency
D．Physician
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.
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