Questions 9—14
· Read this text taken from an article about the concept of strategy of competitions.
· Choose the best sentence to fill each of the gaps.
· For each gap 9—14, mark one letter (A—H) on your Answer Sheet.
· Do not use any letter more than once.
· There is an example at the beginning, (0).

A Random chance determined the mutations and variations that survived and succeeded to compound their numbers.
B In the absence of some counterbalancing force that maintained a stable equilibrium between two competitors by giving each an advantage in his own territory, only one survived.
C True strategy was probably first practiced by one tribe attempting to take over the hunting grounds of another tribe.
D The richer the environment, the more severe the competition and greater the number of competitors.
E Physical and structural characteristics adapted, but behavior adapted also and became embedded in instinctual reactions.
F Each has a unique advantage in competition for its required resources with its particular niche of the environment.
G Darwin emphasized repeatedly the overriding importance of competitive： It is awesome in its potential for evolution.
H If there had been no limitation on required resources, exponential growth would lead to infinite numbers.
根据以上资料请回答第9题：_________