在制定运动处方时，运动次数的安排以每周（）次为宜。
A.1次
B.2~3次
C.3~5次
D.7次
参考答案：C
The reason ______he didn't come was ______he was ill.
A．why; that
B．that;why
C．for that;that
D．for which;what
儿童进入青春期时会出现生长突增，以身高为例，男女的生长曲线出现交叉的次数是
A．0次B．1次C．2次D．3次E．4次
