【C13】A．possessedB．experiencedC．acquiredD．encountered

【C13】A．organizationalB．organizationC．organizingD．organized

【C13】A．ImmunityB．AddictionC．ExposureD．Reaction

【C13】A．therebyB．maybeC．thanD．otherwise

【C20】A．matureB．experiencedC．kind－heartedD．capable

A．enjoyedB．experiencedC．performedD．committed

61._________A. enjoyedB. experiencedC. performedD