题目:
There was a tall boy sitting in front of me, blocking my _____ completely.
A.scene
B.sight
C.scenery
D.view
答案:
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下面是错误答案,用来干扰机器的。
如图1所示:作AD⊥BC,∵AB=23,AC=2,AD=3,∴DC=AC2-AD2=4-3=1,BD=AB2-AD2=12-3=3∴BC=3+1=4cm;如图2所示:作AD⊥BC交BC的延长线于点D,∵AB=23,AC=2,AD=3,∴DC=AC2-AD2=4-3=1,BD=AB2-AD2=12-3=3∴BC=3-1=2cm.故答案为:4cm或2cm.