题目

Vancouver’s Chinatown—Canada’s largest Chinatown Vancouver’s Chinatown is North America’s second biggest Chinatown, after San Francisco’s. Mandarin(普通话)and Cantonese are the mother tongues in 30% of Vancouver homes, which makes Chinese the largest “minority” ethnic group(少数民族). Vancouver’s Chinatown is the place to visit for a taste of Chinese culture. In Chinatown, there are a lot of traditional products and buildings, such as the stone lions which represent for the prestige(名声;声望),many red lanterns which stands for the happiness. What’s more in利用人工合成的性引诱剂诱杀害虫的雄性个体，破坏了种群正常的性别比例，该害虫的种群密度将（　　）? A.明显增加 B.明显减少? C.先减后增 D.相对稳定?