Mark the letter A, B, C, or D to indicate the correct answer to each of the following sentences.

Câu hỏi

People are not worried about security in this area because ________ are installed everywhere.

A. smart cities

B. smart sensors

C. smartphones

D. smart cars

Đáp án
B. smart sensors

Câu hỏi thuộc Bài tập:

REVIEW 1 (Unit 1-2-3) - VOCABULARY - Tiếng Anh 11 Global Success