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20 15 is it difficult to add points to Jiangsu mathematics college entrance examination?
The additional questions in science meet the requirements of the college entrance examination and are moderately difficult. Problem 2 1 (two out of four) is well solved, keeping the original style; Question 22 is a space vector, which is a mid-range question; Question 23 examines counting and mathematical induction, which is novel, innovative and difficult.