【单选题】【消耗次数：1】
20. The joke told by Tom made us_____, so our maths teacher couldn’t make himself _____.
①
to laugh; hearing
②
laughing, heard
③
laughing; hear
④
laughed; heard
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【单选题】
The joke told by Tom made us________,so the teacher couldnt make himself_______.
①
to laugh;hearing
②
laughing;heard
③
laughing;hear
④
laughed;heard
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There was so much noise in the classroom that the teacher couldn’t make himself _______.
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heard
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hearing
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hear
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away from
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up
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12. That’s ______ joke I have ever heard.
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the funniest
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Little Tom is an orphan（孤儿）. _____, he has to make a
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【多选题】
<img src=https://huaweicloudobs.ahjxjy.cn/56BAE75C41ED789808BD74BD796CD190.png title=2.png alt=2.png/><img src=https://huaweicloudobs.ahjxjy.cn/973224FF846365C9CC68773CF913D64F.png title=3.png alt=3.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/2A51130EF26AE0F98297A905C05B74F8.png title=4.png alt=4.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/C256C3ABBF7A188A41B8471B6219F2F2.png title=5.png alt=5.png/><img src=https://huaweicloudobs.ahjxjy.cn/8972CC284E4234178036DF0D9D89BE4C.png title=6.png alt=6.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/084E772FC80268CF0E71B3F81BC1E198.png title=7.png alt=7.png/>
④
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【多选题】
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②
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③
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【判断题】
下列向量组是线性相关的<img src=https://huaweicloudobs.ahjxjy.cn/160EF2776DE7EBF18D7A3D02B50608BD.png title=6.png alt=6.png/>
①
正确
②
错误
【多选题】
阶梯形矩阵必须满足的要求有
①
矩阵自上而下的各行中，每一非零行的第一个非零元素的下方全是零
②
矩阵自上而下的各行中，每一非零行的第一个非零元素的上方全是零
③
元素全为零的行（如果有的话）都在非零行的下边
④
元素全为零的行（如果有的话）有可能在非零行的上边