The infant mortality rate has decreased steadily over the past decades and is now at a lower rate than ever before.


now at a lower rate than

now lower than

now a lower rate than

presently lower than it was

presently lower than the rate was

考题讲解

题目分析:
本题中可以发现比较词lower than,比较的对象必须在逻辑上和语法上对等。想要比较的两者是“现在的婴儿死亡率(The infant mortality rate)”和“到现在为止的婴儿死亡率(The infant mortality rate ever before)”。在(A)(B)(C)中,比较的两者是“现在的婴儿死亡率(The infant mortality rate)”和“到目前为止的婴儿死亡率(The infant mortality rate ever before)”;在(D)(E)中,比较的两者为时态有误,应该用完成时而不是过去时,属于比较对象不对等。在(A)(C)中,由于在整个句子的主语部分已经写明是The infant mortality rate,而不是The infant mortality,所以lower…than之间不需要重复出现rate,可以排除(A)(C),答案为(B)。

选项分析:

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Prep2012-SC

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