一周内每日腹泻4次以上的儿童严禁使用的是（）
A.卡介苗
B.麻疹疫苗
C.白百破疫苗
D.乙脑疫苗
E.脊髓灰质炎疫苗
参考答案：E
简述影响学习动机形成的因素。
She's having a lot of trouble with the new computer, but she doesn't know whom to________. [ ]
A. turn to
B. look for
C. deal with
D. talk about
