9)指代关系

　　e.g. Many weeds are also hosts for disease-causing organisms. At least 50 different weed species fight off competitors by emitting toxins from their roots， leaves， or seeds. These poisons do their work in a variety of ways， such as inhibiting germination of seeds and destroying photosynthesis abilities.

　　The word toxins in the passage is closest in meaning to _____.

　　A. roots

　　B. leaves

　　C. seeds

　　D. poisons

　　10)关键词

　　e.g. nonresidential design concerns public spaces such as concert hall， banks， offices， building lobbies， theater， restaurants， hotels， and religious buildings. Many contract designers specialize in one or more of these areas. Accessories add interest to a room. They can accent or highlight an area and give a room beauty and personality.

　　The word accessories in the passage is closest in meaning to _____.

　　A. things that build a house

　　B. things that destroy a room

　　C. things that improve a room

　　D. things that coat a house