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【多选题】
以下关于变质岩有效定年的说法正确的是( )A.
低级变质作用（低绿片岩相及以下）一般不形成可以有效定年的变质矿物，很难准确定年。
B.
中-高级变质作用（岩相及以上）可以形成一些可以的矿物，如富K矿物（云母）、富U-Th矿物（独居石、榍石、金红石、锆石等）以及石榴子石，可以准确
C.
高压变质作用（蓝片岩相和榴挥岩相）可以形成富K矿物（多硅白云母、蓝闪石）、富U-Th矿物（锆石）以及石榴子石，可以准确定年
D.
变质温压是关键，变质流体也很重要
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举一反三
【单选题】section c now listen to the following recording and answer questions 16 to 19 16
A.
they emphasize on the importance of success
B.
they tell people how to have a good mindset
C.
they teach people how to avoid pressure
D.
they present the key factors to happiness
【单选题】Section C Now listen to the followingrecording and answer questions 16 to 19. 16.
A.
The Nile River.
B.
The Amazon River.
C.
The Mississippi River.
D.
The Missouri River.
【单选题】section c now listen to the following recording and answer questins 16 to 19. 16
A.
they are about philosophy in life
B.
they advise people to learn philosophy
C.
they introduce some difficult jargons
D.
they teach some jargons used in life
【单选题】section c now listen to the following recording and answer questions 16 to 19. 16
A.
they tell people how to release stress
B.
they teach people to be mentally healthy
C.
they show people how to do better work
D.
they focus on interpersonal relationships
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