question: reform:opening
choices.label: A B C D
choices.text: import:export go upstairs:go out signs:tendency new york:texas
explanation: "reform" refers to changing the outdated and unreasonable parts of things to make them reasonable and perfect. "opening" refers to lifting blockades, bans, restrictions, etc. "reform" and "opening" both mean change and have similar meanings "import" and "export" express opposite meanings, not similar. "going upstairs" and "going out" have different meanings and have no similar meanings. there is no obvious logical relationship between "going upstairs" and "going out". "signs" refers to a slight development trend or situation, and "tendency" refers to the direction of development. both have the meaning of development trend and have similar meanings. "new york" and "texas" are both provinces, and "new york" and "texas" refer to two different provinces.
relation: reform opening R1.1
relation: import export R2.4
relation: signs tendency R1.1
relation: new york texas R2.4