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