1Almost all economists agree that nations， gain by trading with one another.
A work
B profit
C rely
D prove
2The conference explored the possibility of closer trade links.
A denied
B investigated
C stressed
D created
3The chemical is deadly to rats but safe to cattle
A fatal
B hateful
C good
D useful
4During his lifetime he was able to accumulate quite a fortune.
A control
B spend
C collect
D exchange
5It’s impolite to cut in when two persons are holding a conversation
A leave
B talk loudly
C stand up
D interrupt
答案：1. B 2. B 3. A 4. C 5. D