尼罗河是世界上最长的河流。[ ]
√
用于稀土增感屏的稀土元素主要是
A．锕系B．镎系C．镧系D．钡系E．碳系
3-junior high school life will be over . I will remember those things and teachers _____ are unforgotten .
A．who
B．which
C．that
D．whom
