一根木料长16米，木工师傅可把它都锯成（ ）米长的一段，而没有剩余。（填全所有能被整除的情况）
1，2，4，8
Scientific research shows that animals can show emotions like human beings. They are sometimes lively, and sometimes bad-tempered.
A．contradictory
B．instant
C．appropriate
D．flexible
具有苦寒降泄，咸能软坚特点的是
A．京大戟
B．大黄
C．芦荟
D．巴豆
E．芒硝
