5. The word "rivalry" in the passage is closest in meaning to ... A) discrimination B) argument C) competition D) problem
6. According to the text, which of the following is not considered to be a typical hazard? A) attacks by the ships of enemies
B) the ignorance of commanders
C) regular storms in seas and oceans
D) the deficiency of foodstuff
7. According to the passage, what was especially frequent for explorers? A) to sail towards the unfamiliar parts of ocean seeking treasure
B) to sell off without essential equipment
C) to be attacked by mild weather conditions
D) to come to other destinations or to lose ways