SECTION 02　4

4.     In
cold-water habitats, certain invertebrates and fish convert starches into
complex carbohydrates called glycerols, in effect manufacturing its own
antifreeze.

(A) in effect
manufacturing its own antifreeze

(B) effectively
manufacturing antifreeze of its own

(C) in effect
manufacturing their own antifreeze

(D) so that they
manufacture their own antifreeze（C）

(E) thus the
manufacture of its own antifreeze

这里　　C　　中的的in effect  是什么意思？？　　什么用法？？

朗文的解释：in effect
used when you are describing what you see as the real facts of a situation
例子：In effect, we'll be earning less than we were last year.