答案不唯一，举例：
如：（4-3）×（4+3）
=16-3
=13，
故答案为4-3．
What lead to the resistance to treatment of the parasite().
A. The use of antibiotics.
B. People’s negligence.
C. The wrong way of using drugs.
D. The treatment with antibiotics and quinine drugs.
中间完全冷却
