Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Câu hỏi

Seattle is one of the most________ cities in the US.

A. ecology

B. ecosystem

C. eco-friendly

D. ecological

Đáp án
D. ecological

Câu hỏi thuộc Bài tập:

Ms. Dung Purple - Unit 10: Ecotourism - Vocabulary