下列关于生物多样性面临威胁的原因叙述中,哪一项不正确?( )
A:毁林开垦,水土流失、环境恶化等原因造成森林面积锐减
B:火山爆发、地震濒发、瘟疫流行等自然灾害是造成我国生物多样性锐减的重要原因
C:人类对动植物资源的滥捕、乱伐及不合理的开发利用,造成大量物种濒临灭绝
D:人类活动缺乏环保意识,造成生物生存环境的严重破坏造成的
American schools begin in September after a long summer holiday. There're two terms in a school year. The first term is from September to January, and the second term is from February to June. Most American children begin to go to school when they're five years old. Most students are seventeen or eighteen years old when they finish high school. High school students take only five or six subjects each term. They usually go to the same classes every day, and they have homework for every class. After class, they do a lot of interesting things. After high school, many students go to college(大学). They usually have to pay a lot of money. So, many college students work after class to get money for their studies.
解决水资源分配不均的措施正确的是( )
下列推断合理的是( )