多项选择题

横槽型寒潮阻高的演变有( )
A、阻高的崩溃使得横槽转竖
B、阻高西退使得横槽转竖
C、阻高稳定维持使得横槽转竖
D、阻高的崩溃使得横槽旋转南下

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单项选择题

Python异常处理中不会用到的关键字是（）。
A、try
B、finally
C、if
D、else

A topic sentence most often appears（）.
A、at the end of a paragraph
B、at the beginning of a paragraph
C、in the middle of a paragraph
D、somewhere near the end

答案： at the beginning of a paragraph