社会流行潮起潮落，变幻万千。面对社会流行，我们应该（   ）

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    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. "

如图所示，煤气管道包括户外和户内两部分，二者之间i车接着一只煤气表。工人师傅给每户安装完户内管道后，都要检查一下管道是否漏气。有一种检测装置，在两端开口的透明U形管中装有水，当U形管两端压强相等时，两侧水面相平。检测时，关闭开关，用力向户内管道口Y内吹气，然后迅速将U形管的Y′一端与Y相连接，U形管内水面出现高度差，继续观察U形管中水面的变化    (    )