http://www.usingenglish.com/reference/phrasal-verbs/zero in ...

Zero in on - Direct or focus attention on
Example:
The police have ZEROED IN ON the man they believed to be responsible for the murder.
Notes:
Inseparable
International English

Zero in on - Head for, move towards
Example:
The hurricane is zeroing in on Florida.
Notes:
Inseparable
International English

http://www.google.cn/search?complete=1&hl=zh-CN&q="report ze...

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This special report zeros in on the problem and lays out some bright and innovative solutions. There is no better time than right now to strengthen your ALOS, continue to improve your hospice's end-of-life care goals for your patients ...
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This edition of Communication will zero in on / focus on / be dedicated to gaokao, the University Entrance Examination.

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Note added at 14 hrs (2007-08-24 14:44:39 GMT)
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The theme/topic of this edition of Communication is...

I assume 直击 is separated from 现场直击 (live report, televise live, broadcast live...) and has been fancified, that is, become a fancy word in the journalistic jargon. Does this edition of Communication report on the examination live? No. It only invites some veteran teachers to the studio to teach some tricks to would-be examinees.