問題詳情

請依下文回答第 21 題至第 25 題： During a transabdominal ultrasound, a conductive gel is placed on the abdomen, and a hand-held wandwhich 21 sound waves is moved in a systematic pattern in an effort to examine the internalstructures. This test requires a 22 bladder so that the organs in question are lifted out of thepelvis as the bladder fills. The patient may be asked to drink two to three glasses of water starting anhour 23 the test. This method works best for more advanced pregnancies when the fetus is welldeveloped. The physician may have a vaginal scan performed during the first trimester to make sure thepregnancy is within the uterus and to rule out an ectopic pregnancy. It is also possible to visualize thefetal heartbeat and movement, and, thus, rule out a miscarriage. The vaginal scan can also determine ifthere is more than one pregnancy within the uterus. During the remainder of the pregnancy, scans maybe used to look for problems, 24 the age and development of the fetus, check out its positionwithin the uterus, and, between 16 and 20 weeks, determine the fetal sex. There is no risk to the womanor her developing fetus with ultrasound, and it is not uncomfortable. Ultrasound examinations aiddoctors in establishing an accurate 25 date. The estimated date of delivery can now be predictedwithin two to four days if the initial ultrasound is performed early in pregnancy.
21
(A)emits
(B)dismisses
(C)neutralizes
(D)eliminates

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