Choose the letter A, B, C, or D to indicate the correct word for each of the blanks from 41 to 45.

When the word "endangered" is mentioned, people usually think of particular species, like the panda or whooping crane. However, we would like to encourage you to think about (41)_____ in a broader context. It is (42)________, the physical places where species live and interact with one another. Although the development of special breeding programs, also known as captive conservation, may help some species in some cases, it is clearly not (43)________answer to the global problem. Indeed, (44)________we are able to protect natural areas where endangered species actually live, they have no future. Species become endangered for a wide (45)________of reasons. By analyzing and grouping many individual cases, however, we find the same broad causes appear again and again. They are Habitat Destruction, Exotic Species, and Overexploitation. Among other factors threatening particular species are limited: distribution, disease, and pollution.

Điền vào số (43)