佝偻病患儿出现枕秃多在（）。
A．1—2个月
B．个月左右
C．6—10个月
D．1岁左右
E．3岁以后
参考答案：B
He is one of the teachers who _____ English but the only one of the teachers who _____ French in our school.
A．know … knows
B．knows … know
C．knows… knows
D．know … know
只有酸性腐蚀品才能对金属产生腐蚀作用。（）
