一台普通相机仅数百元,而一台数码相机却值几千元;一台普通机床仅3万—5万元,而一台数控机床却值100多万元。这一事实告诉我们( ) ①科技进步是提高经济效益的重要途径 ②我国必须大力实施科教兴国战略 ③今后将是科技而不是劳动创造价值 ④科技进步决定商品的价格 A.① B.①② C.①②③ D.①②③④--- What made you unhappy?
--- ________
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A.The noise of a baby's cry woke me up quite early this morning.
B.The bad weather later kept me asleep.
C.The problem troubled my brother.