把14、33、35、30、39、75、143、169八个数平均分成两组使每组四个数的乘积相等．

下列反应中，生成物的总能量大于反应物的总能量的是（　　）

若$\sin \left(\frac{\pi }{3}-\alpha \right)=\frac{1}{4}$，则$\cos \left(\frac{\pi }{3}+2\alpha \right)=$（  ）

阅读短文，选择正确的答案。

    Mrs. Jones was a teacher. Her house was not far from her school, and she often walked there in the morning. All the students in the school were very young.

    One cold and windy morning in October, Mrs.Jones walked to school. The cold wind went into her eyes and big tears（泪）began to run out of them. She reached (到达) the school, opened the door and went into the classroom.

    It was nice and warm there and Mrs. Jones was happy. But then a small boy looked at her for a while, put his arms a round her and said (说):"Don't cry, Mrs. Jones. School isn't very bad. "