问题
选择题
These natural parks are very important for preserving many animals, which would _______ run the risk of becoming extinct.
A．otherwise
B．therefore
C．nevertheless
D．however
答案
答案：A
考查副词词义辨析。run the risk of意为“冒……的危险”。Otherwise要不然；therefore因此；nevertheless仍然，不过；however然而。根据句意最佳答案是A。