【C15】A．specialtyB．powerC．proportionD．place

【C15】A．causeB．courseC．cautionD．case

【C15】A．installmentB．expeditionC．analysisD．option

【C15】A．honorB．favorC．placeD．terms

【C13】A．populationB．ratioC．proportionD．percentage

【C7】A．ratioB．rationC．proportionD．rate

The United States is（).A、a formerB、ritish colonyB、an economic powerC、a cruel oppressorD、