JavaScript的函数名称中可以包含$符号。( )
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利用闭包可以让变量的值始终保持在内存中。( )
A. 对
B. 错
斐波那契数列从第3项开始,每一项都等于前两项之和。( )
A. 对
B. 错
However, today we are coming to realize that tourism is a mixed ______: it has advantages and disadvantages.
A. welfare
B. benefit
C. boon
D. blessing
I was the first to ask him ______ questions that made him embarrassed but there'll be harder ones to come.
A. sharp
B. harsh
C. awkward
D. picky