单项选择题
What is the main content of this audio clip?
A、Helping computer users to protect themselves from cyber attacks.
B、Giving suggestions on how to choose a good computer.
C、Giving information about online crimes.
D、Helping users to set up their computers. 无解析
What is the main content of this audio clip?
A、Helping computer users to protect themselves from cyber attacks.
B、Giving suggestions on how to choose a good computer.
C、Giving information about online crimes.
D、Helping users to set up their computers. 无解析