单项选择题
A.plantB.plainC.planeD.planet
They were leaning（），facing each other.A.forwardB.toward...
单项选择题They were leaning（），facing each other.
A.forwardB.towardsC.backD.against
I had nothing to add（）my earlier statement.A.toB.upC.wi...
单项选择题I had nothing to add（）my earlier statement.
A.toB.upC.withD.for
（）has made smallpox a very rare disease.A.InfectionB.Tr...
单项选择题（）has made smallpox a very rare disease.
A.InfectionB.TreatmentC.VaccinationD.Cure
