问题
单项选择题
Deep-ocean sediments provide better information about the world's past climate be cause they ______.
A．are well protected
B．have land-based evidence
C．are in isolation
D．have a longer history
答案
参考答案：A
解析：[分析] 细节题型。 答案出自第四段第二句Deep-ocean sediments provide a climatic record stretching back hundreds of millions of years...。