阅读理解。   

     My name is Xiaoming. I get up at half past six. I have breakfast at seven o'clock. I go to school at eight o'clock. I have lunch at twelve o'clock. I go home at four o'clock. I have dinner at five o'clock. I watch TV at half past six. I do my homework at seven o;clock. I go to bed at nine o'clock.

范式守信

    范式字巨卿，少游学于太学^①，与汝南^②张劭（shào）。劭字元伯。二人并告^③归乡里。式谓元伯曰：“后二年当还，将过^④尊亲。”乃共克^⑤期日。后期方至，元伯具以白^⑥母，请设馔^⑦以候之。母曰：“二年之别，千里结言，尔何信之诚也?”对曰：“巨卿信士，必不违约。”母曰：“若然，当为尔酝酒。”至其日，巨卿果到，升堂^⑧拜饮，尽欢而别。

【注释】①太学：京城最高学府。②汝南：古地名，今河南境内。③告：告假。④过：拜访。⑤克：约定。⑥白：告诉。⑦撰（zhuàn）：饭食。⑧升堂：登上大厅。

如图，△ABC中，∠C=90°，且AC＝BC＝4，点M满足$\overrightarrow{BM}=3\overrightarrow{MA}$，则$\overrightarrow{CM}·\overrightarrow{CB}$＝(    )