切除部分二级免疫器官对动物免疫功能的影响一般（）
A.非常明显
B.较明显
C.不明显
D.造成免疫缺陷
E.仅造成免疫抑制
参考答案：C
The time and effort he has devoted during the past few years _____ trees in that village are now
considered to be very important. [ ]
A. to planting
B. to plant
C. plant
D. planting
党在社会主义初级阶段的路线是什么？
