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【简答题】
如果x 1 ，x 2 是方程x 2 -3x+1=0的两个根，那么 1 x 1 + 1 x 2 的值等于______．
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反馈参考答案：
举一反三
【单选题】Jim, as well as his sisters, to talk to his parents at present because of misunderstanding.
A.
is prepared
B.
was prepared
C.
are prepared
D.
were prepared
【简答题】After his long talk with his father,____________________________(他的脸上很快就又露出自信的神情).
【单选题】When invited to talk about his achievements, he refused to blow his own ______ and declined to speak at the meeting.
A.
trumpet
B.
whistle
C.
bugle
D.
flute
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