设有如下程序段（）。Dim a(10)……For Each x In aPrint x;Next x在上面的程序段中，变量x必须是
A. 整型变量
B. 变体型变量
C. 动态数组
D. 静态数组
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The kind of visa you apply for mainly depends on ______.
A. what you do to make a living
B. how rich you are as a visitor
C. why you visit the country
D. how long you will stay in the country
Visitors to the United States possible feel that city people of the country are very （）
A. busy
B. kind
C. troubling
D. patient
The "departure date" on the small white form gives the date ______.
A. to which you can extend your stay
B. on which you apply for a longer stay
C. on which you arrive in the country
D. by which you must leave the country
矿井风量按井下同时工作的最多人数计算，每人海分钟供风量不少于( )。
A. 1m3
B. 2m3
C. 3m3
D. 4m3
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