整地
参考答案：
是指种植园改善土壤理化性状，给作物生长尤其是根的发育创造适宜的土壤条件。
By the time he realizes he________into a trap, it’ll be too late for him to do anything about it.[ ]
A. walks
B. walked
C. has walked
D. had walked
CT模拟机的CT值偏差不应超过（）
A.1%
B.2%
C.3%
D.3.5%
E.4%
