求助GWD5-25

joeyzhu

Q25:

The passage suggests that the presence of G10 garnet in a kimberlite pipe indicates that

             

1. the pipe in which the garnet is found has a 90% chance of containing diamonds
2. the levels of calcium and chrome in the pipe are conducive to diamond formation
3. the pipe passed through a diamond-stability field and thus may contain diamonds
4. any diamonds the pipe contains would not have come from the diamond-stability field
5. the pipe’s temperature was so high that it oxidized any diamonds the pipe might have contained

Answer: B

答案给的B，我不太明白，没找到依据。我选的是C

triwater_yu

我同情你 老兄   我也选的C

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