共同核心标准:一年级阅读:文学，一年级写作，二年级阅读:文学，二年级写作
ccss . la - literacy . rl .1.1, ccss . la - literacy . rl .1.2, ccss . la - literacy . rl .1.3, ccss . la - literacy . w.1.1, ccss . la - literacy . rl .2.5, ccss . la - literacy . rl .2.10, ccss . la - literacy . w.2.1
