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Because i chose the science in the second year in high school,i don't have to learn the subjects of politics,history and geography.

I chose to learn sicence in second senior year at the time the classes were divided into two part. Choosing science, it means I don't have to study politics,history and geography any more.

We were divided into classes when we were at senior two. Because I chose the calsses of science, so I didn't need to learn politics、 history and geography.