问题
单项选择题
I was told ______ e-mail the hotel for reservations.
A．either to call or to
B．that I should call or to
C．to either call or to
D．I ought either to call or
答案
参考答案：A
解析：[分析] 结构识别本句意为：我被告知可以给旅馆打电话或发电子邮件来预订房间；“打电话”和“发电子邮件”在句中是平行结构，所用形式应一致，且放在either... or... 之间；因此A为答案。
=xdy满足初值y(1)=0的特解，则
y(x)dx=______．