None of my friends ______at 10, so I realized it was a trick and felt really embarrassed.
A:showed up
B:ended up
C:ate up
D:looked up
某同学看见课桌上有一层灰,拿抹布抹课桌时,不小心手被钉子刺了一下,手臂快速收回,在此反射中神经冲动传导途径是( )
1926年中国的“红三角”牌纯碱闯入万国博览会并获金质奖章。为该荣誉做出的科学家是( )