2019年12月四六级真题答案※ 对答案 ※ 估分

　　仔细阅读

　　46-50 CDACB

　　51-55 DBDCB

　　46.C They can‘t connect professors and students as textbooks do。

　　47.D Falling sales。

　　48.A Reform its structures。

　　49.C Answer questions using their personal experience。

　　50。 B They can learn in an interactive way

　　51.D It gets energy from both food and sunlight。

　　52.B The mechanism by which it conserves energy。

　　53.D They can produce chlorophyll on their own。

　　54.C They don‘t usually function inside animal cells。

　　55.B They can survive for months without eating。

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