题目

关于牛体外受精胚胎的工厂化生产的叙述正确的是 A.精子和卵子受精形成受精卵后即可移入母牛子宫 B.采集的卵母细胞应立即与精子共同放入培养液才能形成受精卵 C.体外受精胚胎的工厂化生产即胚胎发育和受精过程只需在体外进行 D.成熟卵子与获能的精子相遇形成的受精卵，需培养到一定阶段才可以移植还原短文Children know that summer is probably the most fun of all seasons.1._, especially, for children aged 14 and under. In the first study of children’s safety in the US, the National Safe Kids Campaign(运动) (NSKC) found that nearly half of the injury-related (与受伤相关的) deaths among children happen in summer. 2._. They always know summer is a dangerous season for children. During the summer, children are out of school and spend more time outdoors. 3.__. “While we encourage children to be active and spend time outdoors, they need to understand the importance of safety.” Said Everett Koop, an expert of the NSKC. 4._, the NSKC started a “Make it a Safe Kids Summer” Campaign during National Safe Kids Week, from May 5 through May 12. Here are some important summer safety tips from the NSKC:● Always wear your seat belt.● Make sure there is an adult around when you decide to go swimming.● 5._● Obey all traffic laws.A. They are more likely to get into an accident or be injured.B. To help children stay safe.C. Experts are not surprised by the study’s results.D. However, experts say it is also the most dangerous.E. Wear a life jacket (救生衣) when on a boat or doing water sports.F. Children can’t go outside in summer.