仅从储油构造考虑，图中海上石油钻井位置正确的是（    ）

A

    Tom is an eight-year-old student in Grade three. He is not interested in his lessons. He spends most of his time playing basketball. At night, he doesn't sleep until very late in order to play. In the morning, he usually gets up late and hurries to school. Sometimes he sleeps in class.

    Tom's father is worried about his poor schoolwork. He tried to make him work harder. One day, his father said to him, "My boy, if you get one hundred marks in the exam,  I'll buy a new basketball for you." The boy was very happy to hear that.

    The next day  Tom came running home. "Oh, Dad, I got one hundred." He shouted, "I got forty in English this morning and sixty in Chinese this afternoon!"

根据短文内容判断正误。

若弦AB所对的圆心角是120º，则弦AB所对的圆周角的度数是     （   ）

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①氨气____②水____③二氧化碳____

④碱式碳酸铜____⑤氧化铜____⑥氧化镁____

⑦写元素符号：硅____  氯____ 碘____．