请教feifei logic 125题

btmeng

125. A society’sinfant mortality rate is an accepted indicator of that society’s general healthstatus. Even though in some localities in the United States
the rate is higherthan in many developing countries. In the United States, overall the rate hasbeen steadily declining. This declines does not necessarily indicate, however,that babies in the United  States are now, on the average, healthier atbirth than they were in the past.
Which one of thefollowing reasons, if true, most strongly supports the claim made above aboutthe implications of the decline?

A.       The figure for infant mortalityis compiled as an overall rate and thus masks deficiencies in particularlocalities.
B.       Low birth weight is acontributing factor in more than half of the infant deaths in the United States
. C.       The United States
has been developingand his achieved extremely sophisticated technology for saving premature andlow-birth-weight babies, most of whom require extended hospital stays. D.      In eleven states of the United States
,the infant mortality rate declined last year. E.       Babies who do not receiveadequate attention from a caregiver fail to thrive and so they gain weightslowly.

victorbj262

选C.premature和low-birth-weight的婴儿存活下来，导致婴儿死亡率下降，但这些婴儿的健康不佳，不能说明现在的婴儿比过去更健康。
A是干扰项，错误在于A并未说明婴儿死亡率下降本身是错的，只是有些问题。