下面共有15个句子，每个句子中均有1个词或短语划有底横线，请从每个句子后面所给的4个选项中选择1个与划线部分意义最相近的词或短语。答案一律涂在答题卡相应的位置上。
1 Almost all economists agree that nations gain by trading with one another
A work B profit C rely D prove
2 The conference explored the possibility of closer trade links
A denied B investigated C stressed D created
3 The chemical is deadly to rats but safe to cattle.
A fatal B hateful C good D useful
4 During his lifetime he was able to accumulate quite a fortune
A control B spend C collect D exchange
5 Its impolite to cut in when two persons are holding a conversation
A leave B talk loudly C stand up D interrupt
6 I wonder what your aim in life is.
A symbol B goal C action D attitude
7 I have no alternative but to report him to the local police
A opinion B means C choice D selection