1: " ... both of which were particularly attentive or solicitous to a burgeoning youth market thirsty for new information about lifestyle and social issues."Try this dictionary: cater: Definition, Synonyms and Much More from Answers.com
Sometimes reading the word or phrase in a different context helps me get a better handle on the word's meaning. The following is taken from an article called TARGETING THE YOUTH MARKET.i dont think " youth market " has a disapproving meaning like that ,but it is summoned from an article , can you explain for me why?Taking a trip to the local shopping mall any Saturday afternoon provides all the evidence you need that kids represent the fastest-growing market in the U.S. today. Armed with paychecks, allowances and gifts from grandma, teens alone are laying out approximately $95 billion a year. And their younger siblings, ages four to 12, are spending an astounding $14.4 billion annually and influencing other household purchases to the tune of $132 billion.
If these numbers are music to your ears, the song you are hearing is the ringing of cash registers across the country.
Sentence 2: is ungrammatical (*).
2: *"The official reason for the closing Thang wasnt received government permission to operate the site."
It should read like this,
2: The official reason for closing down Thang (a person's name) was that he didn't receive government permission to operate the site.
In 3:, the word Like does not mean alike. It is synonymous with As is the case with,
3: "Like millions of the other teenagers around the globe / As is the case with other teenagers around the globe, Thang loved computer games."
All the best.
Student or Learner