- weaken 的3种方式：
p, but not q
not p, but q
- 可以用这3种方式来套出答案吗？ 比如 P, BUT NOT Q : it is a forger,but it is unevenly weathered.
NOT P, BUT Q: it is a genuine, but it can be evenly weathered ,
C, P: bec it was made by a very special method, so it can be evenly weathered.
3.如何区分P 与 C？比如选项D：是p->q 还是c->p?
- 为什么选项B 是错的？I 我认为 if employees accurately report, superiors will be better informed.
1.cause->effect: restrict to commercial and private(rader) plane->most private(no rader) plane outlying ->reduce the amount of private plane->reduce the risk of collision
2.how to weaken ?
A, NOT B : reduce the amount of private plane, but risk is not reduced
NOT A, B : not reduce the amount of private plane, the risk is reduced
C, NOT B : other factors , bu the risk is not reduced.
3.A选项讲airfield is convenient ,not about risk, so IRRELEVANT
B选择取非后变为 all outlying airfield are equipped to handle commercial-airline traffic ->so the risk is reduced 即C，but B所以不选。
C选项取非后变为 all private palnes are equipped with rader->so not reduce the amount of plane->but the risk of collision is reduced. 即 NOT A, B。因为题目的暗示是如果most of private planes do not have rader, so the risk of collision is high, but if a plane HAS RADER or the amount of plane(no rader ) is reduced, the risk wil be reduced.
D.\选项取非后变为 commerical planes have less risk of collision than private, so if you reduce the amount of private plane, the risk can be reduced. 即A， B ,所以不选。
E 选项虽然提到risk ,但是没有提到 is or not reduce the risk ，所以 不选