题目

已知某病毒的核酸为单链DNA，四种碱基的比率是0.28A、0.32G、0.24T、0.16C。当它感染宿主细胞时，能通过碱基互补配对形成杂合型双链DNA分子，则在杂合型双链DNA分子中四种碱基A、G、C、T的比率依次是（  ）   A、0.24、0.16、0.32、0.28             B、0.26、0.24、0.24、0.26   C、0.28、0.32、0.16、0.24             D、0.24、0.26、0.26、0.24根据短文内容,从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两个为多余选项。Skin-to-skin Effort Aims to Cut Newborn DeathsA social media campaign has been launched in China to cut down the number of newborns babies who die in the first 24 hours of life. The campaign, called First Embrace(拥抱)，promotes skin-to-skin contact between mother and baby immediately after birth, a practice proven to keep the baby warm and help it to fight infections.There are 16 million babies born in China each year, and approximately 150,000 of them die before they reach one month of age. 【1】 Zhang Shuyi, a researcher at the Capital Institute of Pediatrics in Beijing, said there was strong evidence for the First Embrace approach.“When babies are cold, they are more likely to catch infections or have difficulty breathing,” she said,” 【2】 It provides direct protection against infection, promotes bonding between the parent and child and supports breast-feeding.” Health workers who shifted from the normal practice of separation to skin-to-skin contact have observed that babies are more pink, calm and comfortable.The WHO has developed the First Embrace approach to help reduce newborn deaths across the Western Pacific region, including China. Bernhard Schwartlander , the WHO Representative in China, said, “As many as two-thirds of newborn deaths could be prevented using simple, low-cost methods, including the First Embrace.”【3】 The WHO will be posting information about the campaign, and hosting online question-and-answer sessions with Chinese and international experts. The public can participate by following the WHO on Weibo and joining the conversation. Schwartlander said, “We are targeting new parents, pregnant women and couples thinking about having a baby. 【4】 ”Just last month, a new research shows that child and mother health outcomes in Shanghai are equal to those in the USA and Canada. 【5】 Hopefully, the messages conveyed by the new campaign could help to bridge that gap.A. The campaign has now been launched via Weibo.B. Of that number, half die in the first 24 hours of life.C. Skin-to-skin contact keeps a baby warm by transferring heat.D. Those parents who lost their newborn babies can get supports on the platform.E. In other parts of China, however, the statistics are like those of poor countries.F. It indicates that related methods for health care and birth quality should be improved.G. We also aim to involve health professionals in the importance of early essential newborn care.