`1.` Analytics firm Gallup

`-` Dẫn chứng: This week, analytics firm Gallup shared the results of a global survey designed to gauge the world's emotional temperature.

`2.` Yes, they can.

`-` Dẫn chứng: Research has noted the impact negative feelings can have on a person's physical health.

`3.` Yes, they do.

`-` Dẫn chứng: ... while chronic worry and sadness can be signs of anxiety disorders and depression, which carry an increased risk of heart disease.

`4. 1-2` percentage points.

`-` Dẫn chứng: They found that the number of people who said they'd experienced anger increased by two percentage points over the previous year, while both worry and sadness increased by one percentage point.

Đáp án + Giải thích các bước giải:

- Xem những dữ liệu cj gạch cho em trên bài nhé !

C1. Analytics firm Gallup.

C2.Yes.

C3.Yes

C4.1-2 percentage points over the previous year.