【31】A．spotB．identifyC．detectD．notice

【C14】A．feelB．identifyC．revealD．define

【B19】______A．spotB．schemeC．deadlineD．era

【C5】A．simplifyB．identifyC．classifyD．verify

【C20】A．spotB．stageC．platformD．screen

【C15】A．spendB．investC．detectD．test

【C4】A．describeB．identifyC．recognizeD．depict