4. The little boy is _________. A: four years old B: five years old C: six years old D: seven years old

The old man is very healthy. I think he will live______. A: to be 100 years old B: 100 years old C: at 100 years old D: in 100 years old

I separate the variable “age” in my dataset into different catalogue, i.e. 0-25 years old; 26-50 years old; 50 -75 years old. This process is a _______() A: Quantization B: Normalization C: Scaling D: Feature extraction

The woman's daughter is ______. A: four years old B: eight years old C: nine years old

The old man is ______ 50 and 55 years old. A: between B: about C: during

Which period is the best period for children to develop their behavior habits? A: 2-5 years old B: 2-6 years old C: 3-6 years old D: 3-5 years old

How old is Mrs. Stogdale？ A: 89 years old B: 88 years old

6. How old is the Place Museum? A: A. 600 years old in 2020 B: B. 550 years old in 2020 C: C. 610 years old in 2020 D: D. 700 years old in 2020

Visual acuity improves gradually and is emmetropia at ( ) A: 6 months old B: 3 years old C: 4 years old D: 5 years old

Mary is _________ girl. A: an 8—year—old B: 8一years—old C: the 8 years old D: an 8一year old