Why is sustainable management of tropical forests unlikely to be used in the near future?
A.Because tropical forests contain a majority of animal and plant species on Earth.
B.Because we have to wait until the experiment in Peru and the U.S. is finished.
C.Because we have no idea about its effect,and if it fails, our planet will be destroyed.
D.Because besides tropical forests,other areas such as the U.S. also have biodiversity.
第4题
下述肿瘤中,哪一种是良性肿瘤
A.白血病
B.神经母细胞瘤
C.骨母细胞瘤
D.无性细胞瘤
E.骨髓瘤
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!