A:We both like helping people.
B:We both like playing table tennis.
C:We often help old people cross the street.
操心____(cāo chāo) 胆怯____(qiè qǜe) 教训____(xùn xiù)
窘况____(jiǒng jǒng) 撵跑____(niǎn nuǎn) 刻薄____(báo bó)
下列物质的性质中,属于化学性质的是( )
这一现象的合理解释是()