Question 168. Birds aren’t all the same. There are many different                   .

A. categories                     B. species                          C. animals                         D. plants

Question 169. The mountain gorilla is on the verge of                   .

A. extinct                          B. extraction                     C. extinguish                     D. extinction

256 CÂU TỪ VỰNG TỪ ĐỀ CÔ NGUYỄN PHƯƠNG