Seeing _____________(be) believing.
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The blind ____________ (teach) knowledge in special schools.
The United Nations ___________ (found) in 1946.
Ten minutes ______________ (seem) an hour when one is waiting for a phone call.
在古代道士们追求仙丹的过程中,( )逐渐成为了炼制仙丹的头等药材。
A. 黄金
B. 朱砂
C. 白银
D. 雄黄