The wildlife of the Juan Fernandez Archipelago remained...

Câu hỏi: Read the following passage and mark the letter A, B, C or Don your answer sheet to indicate the correct word for each of the blanks from 33 to 37.
The wildlife of the Juan Fernandez Archipelago remained undisturbed until the arrival of European settlers, who introduced their animals to the Islands. Amongst these were goats and cows to be bred for meat and milk, but also rats and mice which had jumped ship. Cats later brought over to kill these pests also quickly escaped into the (33) __________. Little did the settlers understand the impact this would have on local species. The rabbits they'd brought over too, could not be held in captivity for long, and their numbers rapidly expanded. But it was not just fauna that arrived but also (34) __________. Plants such as the blackberry bramble flourished in the tropical climate and spread throughout the native forest.
In the past, the islands' birds had no natural predators. Many therefore evolved to lay their eggs in ground nests. This habit now makes them incredibly (35) __________as rats and mice destroy their eggs and cats devour the newly hatched chicks. Meanwhile grazing goats, rabbits and cows have turned once fertile valleys into wasteland. One now rare tree species is known as the Luma, in which firecrown hummingbirds nests. Today the Luma is being covered over by spiky blackberry brambles, the hummingbird's natural habitat is disappearing and the fear is that they will soon (36) __________. Conservationists from Chile and around the world are uniting to show the urgent need for preservation of these islands' original and unique species. They know the best way to do this is to (37) __________the plants and animals that are alien species.
The word or phrase which best fits the gap (34) is...
A. crops
B. flora
C. vegetation
D. weeds