已知(k－2)x｜k｜－1－2y＝1，则k______时，它是二元一次方程；k＝_爱下问搜题

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问题填空题

已知(k－2)x^｜k｜－1－2y＝1，则k______时，它是二元一次方程；k＝______时，它是一元一次方程．

答案

－2；2．

由二元一次方程的定义知：,解得.

同理：由一元一次方程的定义知：，即k=2

完形填空

从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
It was one of the hottest days of the dry season. We had not seen        in almost a month. Every day , my husband would        the process of trying to get water to the fields.        we saw some rain soon, we would lose everything.
On this day I learned the true lesson of        and witnessed the only        I had ever seen . I was in the kitchen when I saw my son, Billy,        toward the woods. He was walking with effort, trying to be as        as possible . Minutes after he        into the woods, he came running back . I went back to make sandwiches ,        that whatever he had been doing was completed. Moments later,        , he was once again walking slowly toward the woods. This activity went on for an hour .        I couldn’t help following him and saw the most amazing        .
Several large deer stood in front of him. Billy walked right up to them . I almost        for him to get away . A huge deer was        close .        the deer didn’t even move as Billy knelt down. I saw a tiny deer lying on the ground , obviously suffering from        , lift its head to lap up the water cupped in Billy’s hands. When the water was        , Billy ran back to get more . It then became        to me.
I stood on the edge of the woods, watching the        boy working so hard to save another life. As my tears began to hit the ground, they were suddenly joined by other drops. It was as if the God himself was        with pride. The rain that day saved our farm just like the actions of one little boy who saved another.

D．disappeared

D．calculating

D．Surprisingly

C．dangerously

D．aggressively

单项选择题 A1/A2型题

维生素C的生理功能除外（）。

A.抗氧化作用

B.促进小肠钙吸收

C.神经介质和类固醇的羟化反应

D.参与胶原合成

E.解毒作用