Why can't some farmers find enough workers to pick fruit?

• A、They grow too many peach trees.

• B、People prefer well-paid construction jobs

• C、Few people want to work in California

• D、They don't want to hire workers from Mexico.

51.

What happens when ice dams break?（）

• A、They may quickly block the river.

• B、The ice covering the river may melt fast.

• C、A larger ice dam may soon be formed.

• D、The areas down the river maybe flooded