“恩物”是蒙台梭利设计的一套教育材料，象征着上帝给儿童的礼物
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建构游戏的材料只有积木和辅助材料
A. 对
B. 错
He considered studying medicine but fainted ____________ blood, so he switched to civil engineering.
A. at the sound of
B. at the thought of
C. at the sight of
D. at the smell of
The exhibition has been held ______________ World Press Freedom Day annual celebration.
A. on the occasion of
B. on occasion
C. on every occasion
D. on rare occasions
During wintertime, snow may fall in southern China _______________ .
A. on the occasion of
B. on occasion
C. on every occasion
D. on rare occasions
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