He got to the cinema at last but ____ he_爱下问搜题

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问题选择题

He got to the cinema at last but ____ he couldn't find his ticket. [ ]

A. seriously

B. unfortunately

C. fortunately

D. unluckly

答案

答案：B

选择题

下列结论中，正确的是（　　）

A．“∃x∈Q，x²-5=0”的否定是假命题

B．“∃x∈R，x²+1＜1”的否定是“∀x∈R，x²+1＜1”

C．“2≤2”是真命题

D．“∀x∈R，x²+1≠0”的否定是真命题

单项选择题

急性白血病最常见的死因是

A．感染

B．中枢神经系统白血病

C．以上都不是

D．全身衰竭

E．颅内出血