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【判断题】
温度升高时，本征半导体内的自由电子和空穴数目增多，且增量相等。（ ）A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】听力原文：M: Hello. Matt Ellis speaking. W: Hello, Dr. Ellis, my name's Mary Johnson. My roommate, Janet Holms, wanted me to call you. M: Janet Holms? Oh, that' s right she' s in my class. Has anything hap...
A.
She refused to submit her essay.
B.
She sent a job application.
C.
She had an interview.
D.
She had an accident.
【单选题】If she says such things, she is not a friend of ______.
A.
my mother's
B.
my mothers'
C.
my mothers
D.
my mother
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