题干
图文配对。
① 
____ A. It's very cold in winter
② 
____ B. My favourite season is spring.
③ 
____ C. It is summer.
答案(点此获取答案解析）
C,A,B
图文配对。
① ____ A. It's very cold in winter
② ____ B. My favourite season is spring.
③ ____ C. It is summer.
均不产生进位现象,则称n为“良数”.例如:32是“良数”，因为32+33+34不产生进位现象；23不是“良数”，因为23+24+25产生进位现象.那么小于1000的“良数”的个数为 ( )