问题
选择题
Could it be in the room _________ we had a talk last night ___________ you left your keys ?
A．that; where
B．in which; where
C．where ; that
D．where ; where 
答案
答案：C
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Could it be in the room _________ we had a talk last night ___________ you left your keys ?
A．that; where
B．in which; where
C．where ; that
D．where ; where
答案：C
．已知铀238经过一系列衰变，最终变为铅206．设开始时岩石中全部是铀238，铀238的相对含量随时间变化规律如图所示，图中N为铀238的原子数，N0为铀和铅的总原子数，由此可判断出（ ）