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假设有一道四选一的选择题,某学生知道正确答案的可能性为 1/3,他不知道正确答案时猜对的概率是 1/4。试问该生答对的概率?

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As we have reached the decision, no(far)______discussion is necessary.

It is the first time for the people in this region(see)______a total solar eclipse(日全食) in many years.

An(increase)______number of people are saying that what is lacking from modem pop musicis good new songs.

The old lady couldn't do anything except(complain)______about something.

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