C，with inflation to remain essentially under control=if the inflation was to remain essentially under control, to do表示尚未发生。根据主将从现规则，条件部分用一般现在时表示在某事发生的情况下，而不能用将来时。
remain，动词。
A/C：
A，differences in how the two ears hear a given sound，how引导名词性从句，句子核心是：“两只耳朵如何听一个声音的差异”
C，differences in the two ears hearing a given sound，句子核心是：“两个耳朵的差异”，“听一个声音”作ears的定语，置于differences从句的第二层，没有A的表达效果好。
as seen过去分词作伴随状语，逻辑主语是主句主语the rate at which trees grow，这点C/E都是合理的
C，on earth作主句状语，修饰谓语动词is believed，意为在地球上，树木的生长速率被认为是最可靠的迹象之一（那么在月球上就不这么认为了？）；E，on earth作indications的定语，是地球上最可靠的指标之一，ok
C，most of them at least as large as Jupiter做80 massive planets的同位语，circling做定语。
some of them/some除了引导完整句外，也可以用于独立结构（同位语，非从句）
eg.:
This model explains all known subatomic particles, some discovered only recently.
When at university, Tom did many travels, some of them places of interest.
Studies have demonstrated that only about 10 percent of buyers for many types of frequently purchased consumer goods are 100 percent loyal to a particular brand over a one-year period. Moreover, 100-percent-loyal buyers tend to be light buyers of the product or service.
The reasons for this behavior are fairly straightforward: people buy different brands for different occasions or for variety, or a brand may be the only one in stock or may offer better value because of a special deal.
纯纯的眼神不好看错了，D确认一个支持在管理者中间普遍存在的观点的来源！！！
E.表明一个可以让一个特定的myth小时的方式途径。themyth that labor rates and labor costs are equivalent is supported by business journalists，who frequently confound the two.
A，earn more pay than blue-collar workers可以看成是earn more pay than blue-collar workers do,因为根据语意workers只能跟CEOS平行，workers earn pay，不能是earn workers
【the real problems with choice a: 】 - 'the ratio of 42 times' is redundant; it'd be good enough just to say '42 times'.
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C，with inflation to remain essentially under control=if the inflation was to remain essentially under control, to do表示尚未发生。根据主将从现规则，条件部分用一般现在时表示在某事发生的情况下，而不能用将来时。remain，动词。