The application scope of ultrasonic technology in obstetrics are（） A: prenatal diagnosis of fetal malformations B: genetic ultrasound C: intrauterine management of high-risk pregnancy D: interventional ultrasound and intrauterine therapy

pregnant women, who must be careful about taking drugs as certain drugs cause fetal malformations. A: 要当心服药，怀孕妇女因一些药物导致婴儿变形 B: 孕妇：应慎重服用药物，因为某些药会致使胎儿畸形