十字型三维观测系统是（）观测系统。
A.规则型
B.不规则型
C.树状
D.以上说法都不对
参考答案：A
改错。
( ) 1. The small bag have got two wheels.
A B C _______
( ) 2. This red T-shirt is to big for me.
( ) 3. My mother will buys me a new bike.
(2)
