According to Paragraph 1,why does the author scratch his head?

• A、Because he doesn' t know what to do once schools are closed
  
  

• B、Because he is not sure about the practicability of those new tests

• C、Because he is concerned that many teachers will lose their jobs

• D、Because he is not in favor of the government' s reform efforts.

How many non-apple eaters answered survey questions in the research?

• A、149

• B、7,646

• C、753

• D、8,399

56（）