How many experiments about digital detox are mentioned in this text?
A: One
B: Two
C: Three
A: One
B: Two
C: Three
举一反三
- How many types of quotations? A: One B: Two C: Three
- How many clefs are there in the piano? A: Three B: One C: Two D: No clef
- How many junior managers resigned in June A: one B: two C: three
- How many bedrooms are there in the new house? A: Four B: Three C: Two D: One
- How many morphemes are there in the word "international"? A: one B: two C: three D: four