题目内容

理财就是投资。()

A. 对
B. 错

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至今为止,诺贝尔基金每年的投资形式只包括银行存款和公债,尚没有参与风险更大的股票投资等形式。()

A. 对
B. 错

Recently an 1) _________ heavy smog hit the city, making the air 2) _________ to breathe. Air pollution has been a serious problem in the city for years. It is caused by the rapid 3) ____________ growth in the country. Coal-burning energy plants emit harmful gases into the air and millions of 4) _________ in the city add to the pollution. Clean air is very important to people’s 5) __________ of life. Unfortunately, as long as economic growth remains the city’s first priority, it is 6) _________ that a big sea change will take place any time soon.

已知2000年世界人口为60亿,若当年的人口增长率为12‰,地球对人类的最大容载量为150亿,按上述增长率,多少年以后,人口将增长到120亿。(注:写计算过程)(已知::ln1=0,ln2=0.693 ln3=1.099 ln4=1.386 ln5=1.609 ln6=1.792 ln7=1.946)

某一封闭性草场,面积100公顷,每年同化的太阳能为5×108大卡/公顷。若此草场营养级间能量流动遵循林德曼1/10效率,请问此草场一年最多能养活多少只羊,多少只狼?(已知:一只羊每天消耗1000大卡能量;一只狼每天消耗2000大卡能量。一年按360天计算)。(5.0)

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