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[单选题]
在一些水域中，由于氮、磷等矿物质过多而引起一些浮游生物的突然增殖，并引起水色异常，即赤潮现象。这一现象属于 ( )
A
生态入侵
B
种群平衡
C
季节消长
D
种群爆发
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试题答案：
D
答案解释：
相关题目
认为群落并非自然界的实体，而是生态学家为了便于研究，从一个连续变化着的植被连续体中，人为确定的一组物种的集合，这种群落性质观点是 。
经验证明，要使一个国家或地区的生态环境比较优越，其森林覆盖率要达到（ ）
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森林生态系统中的食物链主要由草食食物链和腐屑食物链交织而成，其中__________占优势。
生态学研究的内容包括个体、__________、生物群落、生态系统等。
下列生态因子中，对生物的作用起直接作用的是( )
“生态学”这一学科名词最早是由德国动物学家海克尔提出的。 ( )
森林中鸟的数量与森林的周长成正比，是因为服从边缘效应。( )
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CA woman:heads into apopular New York City coffee shop on a cold: winter rooming. Just ahead of her, a man drops a few papers. The woman pauses to help gather them. A clerk ata busy store thanks a customer who has just bought something. "Enjoy" the young woman says, smiling widely. "Have a nice day." She sounds like she really means it. These arethe common situations we may see every: day.However, in her best-selling book Talk to the Hand, Lynne Truss argues that common good manners such as saying "Excuse me" almost no longer exist. There are certainly plenty who would agree with her. According to one recent study, 70 percent of the U.S. adults (成A.)said people are ruder now than they were 20 years ago.Is it really true? We decided to find out if good manners are really hard to see. In this politeness study, reporters were sent to many cities in the world. They performed three experiments: "door tests" (would anyone hold the door open for them?); "paper drops" (who would help them gather a pile of "accidentally" dropped papers?); and "service tests" (which salesclerks would thank them for a purchase ?)In New York, 60 tests (20 of each type)were done. Along the way, the reporters met all types of people: men and women of different races, ages, professions (职业), and income levels. And guess what? In the end, four out of every five :people they met passed their: politeness test making New York the most polite city in the study.
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