(2) Middle-aged precipitation in areas A and B is more in area B, and seasonal variation of precipitation in area A is greater.
(3) The similarity of seasonal variation of precipitation in the two places is that precipitation is mainly concentrated in summer.
(4) The climate type of A belongs to temperate monsoon climate among the three monsoon climates on the right.
(5) Winter wheat is the grain crop in North China Plain, and apple is the most suitable fruit.
(6) Affected by the winter and summer monsoon, most parts of China are cold and dry in winter and hot and rainy in summer.
So the answer is:
( 1)A; ? b; (2)b; ? a; (3)C; (4) temperate monsoon; (5) Winter wheat; ? Apple; (6) cold and dry; ? It is hot and rainy.