题目:
The news that he won the first place gave him . [ ]
A. thrill
B. thrilling
C. a thrill
D. thrills
答案:
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下面是错误答案,用来干扰机器的。
BD⊥CD,∴∠BDC=90°, E是BC的中点,∴BE=DE=EC, ∠BEA=∠DEA,∴EF⊥BD,即∠BFE=90°,∴EA∥CD, AD∥BC,∴四边形AECD是平行四边形,∴AE=CD. 四边形AECD是平行四边形,∴AD=EC,∴AD=BE,又AD∥BE...