_________(55)A.boys B.others C.students D.grown-u

55._________A. lengthB. dealC. lotD. extent

55._________A. letsB. allowsC. makesD. leaves

55._________A. inB. atC. withD. out

55._________A. tellB. denyC. confirmD. argue

61._________A.people B.adults C.members D.grown-u

化学泡沫灭火器的使用温度范围是________A．-10～55℃ B．-21～55℃ C．4～55