The word 'that” in paragraph three refers to ___________.

* Hướng dẫn giải

Dẫn chứng: These developments are found in products used throughout the world. Some examples are catalytic converters in automobiles that help remove air pollutants, devices in computers that read from and write to the hard disk, certain sunscreens and cosmetics that transparently block harmful radiation from the Sun, and special coatings for sports clothes and gear that help improve the gear and possibly enhance the athlete's performance.

Chọn đáp án A. converters