【C13】A．unchallengingB．inchallengingC．dischallengingD．dechallenging

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

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

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

【C13】A．subtitlesB．provisionsC．providenceD．subjection

【C13】A．inclinedB．relatedC．affectedD．effected

【C13】A．whichB．theseC．thatD．this