Science and technology are developing quickly that some new electronic products are out-o

问题补充：

Science and technology are developing quickly that some new electronic products are out-of-date within several months.

A. very

B. so

C. such

D. too

答案：

A. very

(答案→)B. so

C. such

D. too

解析：考察固定句式。固定句式so…that…如此…以至于…；so后面要接形容词或者副词。Sucn…that…中的such后面要接名词，或者名词短语；AC两项后面不能接that从句。句意：科技进步得如此之快，以至于一些新的电子产品几个月就过时了。故B正确。