假设你是江林，请你写一封信给校长，建议改善本校体育设施状况，内容应涉及体育设施对大学生的重要性，目前学校体育设 施的状况(football ground sports hall)等，可以是表扬，可以是批评建议，也可以兼而有之。

A．the circulation of atmosphere protects the biosphere and makes life on earth possible.
B．if the protective atmosphere is too damaged by human activity, all life will cease.
C．life is the result of complex interdependent events of nature
D．despite the complexity and power of the atmosphere humans can affect it greatly

A．live in the depths of the ocean
B．are one-celled
C．have survived through the ages
D．demonstrates climatic changes prior to humans