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  3. The idea of test-tube babies may make you either delighted at the wonders of modern medicine or irritated while considering the

The idea of test-tube babies may make you either delighted at the wonders of modern medicine or irritated while considering the

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问题    The idea of test-tube babies may make you either delighted at the wonders of modern medicine or irritated while considering the moral, or legal, or technological implications of starting life in a laboratory. But if you’ve ever been pregnant yourself, one thing is certain: You wonder what it’s like to carry a test-tube baby. Are these pregnancies normal? Are the babies normal?
   The earliest answers come from Australia, where a group of medical experts at the Queen Victoria Medical Center in Melbourne have taken a look at the continent’s first nine successful in vitro pregnancies. The Australians report that the pregnancies themselves seemed to proceed according to plan, but at birth some unusual trends did show up. Seven of the nine babies turned out to be girls. Six of the nine were delivered by Caesarean section. Undone baby, a twin, was born with a serious heart defect and a few days later developed life-threatening problems.
   What does it all mean? Even the doctors don’t know for sure, because the numbers are so small. The proportion of girls to boys is high, but until there are many more test-tube babies none will know whether that’s something that just happened to be like that or something special that happens when egg meets sperm in a test tube instead of a Fallopian tube. The same thing is true of the single heart defect; it usually shows up in only 15 out of 60, 000 births in that part of Australia, but the fact that it occurred in one out of nine test-tube babies does not necessarily mean that they are at special risk. One thing the doctors can explain is the high number of Caesareans. Most of the mothers were older, had long histories of fertility problems and in some cases had had surgery on the fallopian tubes, all of which made them likely candidates for Caesareans anyway.
   The Australian researchers report that they are quite encouraged. All the babies are now making normal progress even the twin with the birth defects.
Which of the following explanations regarding the high number of Caesarean operations is NOT true?
选项 A、Some mothers have passed the best age for a natural delivery.
B、Some mothers have physical problems with pregnancy.
C、Some mothers volunteer to be the candidates of the Caesarean operations.
D、Some mothers have had surgical operations on the fallopian tubes.
答案C
解析 推理题。根据第三段的最后两句话“One thing the doctors can explain is the high number of Caesareans．Most of the mothers were oldeL had long histories of fertility problems and in some cases had had surgery on the fallopian tubes，all of which made them likely candidates for Caesareans anyway．”(医生唯一可以解释的是较高的剖腹产率。大部分母亲年纪比较大，长期患有生育问题，有些还在输卵管上做过手术，所有这些使得她们很可能需要进行剖腹产。)
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