1. How much was the overall seroprevalence in the fourth round of National Serosurvey?
- 58.7%
- 88.2%
- 67.6%
- 77.1%
3
5. Which smartphone maker has become the world's second-biggest smartphone brand in second quarter of 2021?
- Vivo
- Xiaomi
- Huawei
- Oppo
18
6. Amazon founder Jeff Bezos’ trip to the edge of space lasted for how many minutes?
- 9
- 11
- 15
- 20
22
8. Which sports will be returning to the Olympics this year after being cut out previously?
- Golf
- Baseball
- Fencing
- Judo
30
9. Which nation is always first in the Parade of Nations at the Olympics opening ceremony?
- Rome
- Greece
- UK
- Italy
34