IN SPITE OF HER DIFFICULT LIVING CONDITIONS, SHE WORKED EXTREMELY...

45. In spite of her difficult living conditions, she worked extremely hard.A. pretty B. hardly C. excellently D. veryX. Read the following passage and mark the letter A, B, C, or D on your answer sheet toindicate the correct word(s) for each of the blanks from 46 to 50.WHY DO ANIMALS GO EXTINCT?Different kinds of animals have appeared and disappeared throughout Earth's history. Someanimals go extinct because the climate (46)_______ they live changes. The climate may becomewetter or drier. It may become warmer or cooler. If the animals cannot change, or adapt, to the newclimate, they die.Some animals go extinct because they cannot (47)_______ with other animals for food. Someanimals go extinct because they are killed by enemies. New kinds of animals are always evolving.Evolving means that the animals are changing (48)_______ from generation to generation. Smalldifferences between parents, children, and grandchildren slowly add up over many, manygenerations. Eventually, a different kind of animal evolves.Sometimes many of the animals on Earth go extinct at the (49)_______ time. Scientists call thisa mass extinction. Scientists think there (50)_______ at least five mass extinctions in Earth's history.The last mass extinction happened about 65 million years ago. This mass extinction killed off thedinosaurs.