给下面词组中的“衔”选择正确的字义

A.用嘴含 B.存在心里 C.等级或称号  D.连接

衔冤____    军衔____      衔接____   头衔____

The boy in the picture is Mike.(对划线部分提问)

____

函数$f\left(x\right)=x^{\frac{1}{2}}-(\frac{1}{2}{)}^x$的零点个数为(     )

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. "