等腰三角形的两边长为2和4，则底边上的高为（ ）。
句型转换。
1.Jim likes French fries.（变否定句）
Jim ___ ____ French fries.
2.Betty doesn’t have tomatoes.（变肯定句）
Betty ____ tomatoes.
3.She eats vegetables and fruits every day.（变为一般疑问句）
she vegetables fruits every day？
4.My sister has eggs and apples for breakfast（划线提问）.
____ _____ your sister _____ for breakfast?
5.Does your father have chicken for lunch?（否定回答）
____ , he _____.
CIP
s.（变否定句）