[单选题]I guess we’ve already talked about this before but I’ll ask you again just .

正确答案 ：C

in case

解析：解析：本题考查介词短语。分析四个选项的意思：by nature 天生地；in return作为回报，作为交换；in case 万一，以防；by chance偶然地。根据句意：我想我之前已经跟你谈论过这件事，但是以防万一，我再问你一次。

[单选题]The underlined word “dissolve” is used to express the idea that organic matter and minerals from soil are .

正确答案 ：D

mixed with water and become part of it

[单选题]The word“shoot”underlined in the 2nd passage probably means“”.

正确答案 ：B

move quickly

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