1.128 In certain computer languages (such as APL), when an algebraic expression contains no parentheses, the operations in the expression are specified to be performed from right to left. For example, in such a language, $a \times b-c$ is equivalent to $a(b-c)$ in standard algebraic notation. Now, an expression is written in this language: $a \div b-c+d$. Then, in standard algebraic notation, it should be
(A) $\frac{a}{b}-c+d$.
(B) $\frac{a}{b}-c-d$.
(C) $\frac{d+c-b}{a}$.
(D) $\frac{a}{b-c+d}$.
(E) $\frac{a}{b-c-d}$.
(36th American High School Mathematics Examination, 1985)
[Solution] The expression should be
$$
a \div[b-(c+d)]=\frac{a}{b-c-d} .
$$

Therefore, the correct choice is $(E)$.