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【简答题】
某口袋内装有大小相同的5只球，其中3只，2只黑球，从中一次摸出2只球. （1）共有多少个基本事件？ （2）摸出的2只球都是的概率是多少？
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举一反三
【单选题】What was the writer's opinion of the psychologist?
A.
He was inefficient at his job.
B.
He was unsympathetic.
C.
He was unhappy with his job.
D.
He was very aggressive.
【单选题】When the writer discusses Piaget's theory, ______.
A.
he is in favour of it
B.
he is critical of it
C.
his view is balanced
D.
he strongly despises it
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