图中所示地区的农作物熟制是（ ）
A．一年一熟
B．一年两熟
C．一年三熟
D．两年三熟
图中所示地区的农作物熟制是一年一熟．根据题意．
故选：A．
非特异性感染常见的致病菌是（）
A.破伤风杆菌
B.结核杆菌
C.β溶血性链球菌
D.真菌
E.梭状芽孢杆菌
Which one of the following best characterizes the alternative hypothesis The alternative hypothesis is usually the:（）
A. hypothesis that is proved through statistical testing.
B. hoped -for outcome.
C. hypothesis to be proved through statistical testing.
