皮皮学，免费搜题
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【判断题】
考察知识点【矩阵的逆】A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】With the help of high technology, more and more substances _________ in the past years.
A.
discovered
B.
have discovered
C.
had been discovered
D.
have been discovered
【单选题】If you get a raise, you’ll _________ be expected to shoulder more responsibility and work longer hours.
A.
no doubt
B.
no longer
C.
no excuse
D.
no chance
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