－How do you usually find out about new software?－In the magazines like Popular Electronics

问题补充：

－How do you usually find out about new software?

－In the magazines like Popular Electronics. That’scomputer companies usually advertise.

A. which

B. where

C. what

D. why

答案：

A. which

(答案→)B. where

C. what

D. why

解析： 考查表语从句。本题中引导词指的是In the magazines like Popular Electronics，故选A，那就是电脑公司通常做广告的地方。