电视剧《五星红旗迎风飘扬》表现了老一辈科学家成功研制“两弹一星”的故事。下列人物在其中必然出现的是（    ）

某阳离子的结构示意图为，则x的数值可能是（　　）

根据短文内容，选择正确答案。
C
    Mr. Brown lives in a nice house in a small town with his wife，Mrs. Brown. From Monday to Friday he works in an office near his house. He is free on Saturdays and Sundays. He has a nice garden beside his house. He likes growing flowers and he often works in the garden on Saturdays and Sundays. The flowers are very beautiful and Mrs. Brown likes them very much. She often helps Mr. Brown.

下列神经调节中，不符合实际情况的是

“当海南岛进入春耕时节，黑龙江还是一片冰天雪地”。这句话说明了（  ）