our earth, or else it will be no longer fit for us to live on.
A．ProtectB．To protectC．ProtectingD．Protected
A
考查特殊句式。祈使句+ and / or 后用一般將來時態(tài)，句意：保護好地球，否則它將不再適合我們在上面生活。所以選A。
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