托福考试

根据网考网考试中心的统计分析，以下试题在2018/10/9日托福考试习题练习中，答错率较高，为：67%
【单选题】 According to the passage, the most dramatic change to the oceans caused by plankton during the Cretaceous period concerned
A．( the depth of the water
B．( the makeup of the sediment on the ocean floor
C．( the decrease ill petroleum-producing sediment
D．( a decline ill the quantity of calcareous ooze on the seafloor

网考网参考答案：B，答错率：67%
网考网试题解析：
暂时没有解析查看试题解析出处>>