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【单选题】
劳动者提前 以书面形式通知用人单位,可以解除劳动合同。A.
十日
B.
十五日
C.
三十日
D.
三日
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反馈参考答案：
举一反三
【单选题】下列生物学实验操作,不合理的是
A.
分离色素时，往试管中加入层析液，使液面高度低于滤液细线
B.
使用血球计数板计数酵母菌时，要先将培养液混合均匀再取出
C.
鉴定酒精时，可以直接将重铬酸钾溶液滴入待测溶液观察颜色变化
D.
观察洋葱根尖有丝分裂时，解离之后经过漂洗就可以用龙胆紫溶液染色
【简答题】对象是人们要研究的任何事物,主要的对象类型有
【单选题】All flights ______ because of the snowstorm, many passengers could do nothing but take the train.
A.
had been canceled
B.
have been canceled
C.
were canceled
D.
having been canceled
【简答题】All flights ________ because of the snowstorm, many passengers could do nothing but take the train. A) had been canceled B) have been canceled C) were canceled D) having been canceled
【单选题】What could the girl in the ticket office do for the passengers without asking the computer?
A.
She could sell a ticket.
B.
She could write out a ticket.
C.
She could answer the passengers' questions.
D.
She could do nothing.
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