D．fish become less aggressive when placed in a 100­gallon tank

　　答案　D　[推理判断题。由倒数第二段最后一句可知，如果把鱼放在100加仑的鱼缸里，它们会停止攻击，故选D项。A项太片面；由倒数第二段最后一句可排除B、C两项。]

　　4．The best title for this passage might be ________．

　　A．Animals' Right to Live at Ease

　　B．Picture of Relaxation Only If You're Not Inside

　　C．How to Keep Tropical Fish as Pets

　　D．How to Deal with Fish's Aggressive Behavior

　　答案　B　[主旨大意题。由短文内容可知，作者主要告诉我们鱼缸的大小决定鱼生活得是否舒适、侵略性的大小，故选B项。]

　　阅读下列材料，从每题所给的选项中选出最佳选项。体裁：说明文　话题：团购　词数：407　时间：6′

　　Group buying is one of the fastest growing trends in South Africa today.Industry leaders are confident the growth potential remains strong since group buying is location­specific (区域性的)．Start­up costs are low and profit room remains high, so many sites continue to receive invested money despite widespread criticism and Facebook's decision to phase__out__of the deals business due to privacy concerns.

　　In the early stages of all industries, some companies fail because they cannot compete with stronger companies in difficult economic conditions.To deal with difficult conditions, an alarming number of businesses are developing group buying websites in places like China and India, so the increase of group buying in South Africa is nothing more than a natural progression into the international mainstream.

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