问答题

Medical researchers are painfully aware that there are many problems （）(他们至今没有答案).

【参考答案】

to which they have not found solutions so far

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单项选择题
According to Professor Naomi White of Monash University, when one’s kids are criticised, their parents will probably feel（）

A．discouraged
B．puzzled
C．hurt
D．overwhelmed
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