$32 \cdot 14$ If a sequence of numbers, except for the first and last numbers, each number is equal to the sum of the two adjacent numbers, it is called having the "oscillatory property". For example, $2,3,1,-2,-3$ works, because $3=2+1,1=3-2,-2=1-3$. It is known that in the following expression, each * represents a number, and satisfies the "oscillatory property".
$$
1 * * * * * * * * * * * * * * * * * * 1
$$

Then the sum of the 18 * represented numbers is
(A) -64 .
(B) 64 .
(C) 18 .
(D) 0 .
(3rd "Five Sheep Cup" Junior High School Mathematics Competition, 1991)
［Solution］Let the number represented by the first * from the left be $x$, then it is easy to deduce that the first 6 * in sequence are $\quad x, x-1,-1,-x, 1-x, 1$.

The 7th * is $x$ again, so the 7th to 12th *; the 13th to 18th * repeat the above six numbers.
Therefore, the sum of the 18 numbers represented by these * is
$$
3[x+(x-1)-1-x+(1-x)+1]=0 .
$$

Hence, the answer is ( D).