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16. Moviegoers know that many special effects are created by computers,         they often don' tknow is that these scenes still require a lot of work.

• A、That 

• B、 Whom
  

• C、 What

• D、How

9.Nowadays little knowledge __ to be a dangerous thing.

• A、seem

• B、seemed

• C、does seem

• D、do seem