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【单选题】
num = 8if (num >= 0 and num <= 5) or (num >= 10 and num <= 15): print '；hello'；else: print '；undefine'；A.
hello
B.
undefine
C.
helloundefine
D.
undefinehello
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【单选题】The advantages and disadvantages of a large population have long been a subject of discussion among economists (经济学家). It has been argued that the supply of good land is limited. To feed a large popul...
A.
higher productivity, but a lower average income
B.
lower productivity, but a higher average income
C.
lower productivity, and a lower average income
D.
higher productivity, and a higher average income