0 is a natural number, neither positive nor negative;

2. Right

3. Wrong,

"Zero" is the smallest natural number.

Rational numbers can include:

(1) Integer: Positive integers, 0 and negative integers are collectively called integers.

(2) Scores: Positive scores and negative scores are collectively referred to as scores.

Of course, as for finite decimals and infinite circulating decimals, these "decimals" can be unified into fractions.

For example, 3, -98. 1 1, 5.77272, 7/22 ... are all rational numbers.

4. Right

0 is neither positive nor negative, but a number between positive and negative.

5. Right

Choose d in multiple-choice questions