11.   The federal Centers for Disease Control and Prevention is not sure yet whether there will be a shortage this season.

12.   The federal Centers for Disease Control and Prevention is not yet willing to recommend widespread screenings for the disorder.

13.   The federal Centers for Disease Control and Prevention is helping the state health department keep an eye on illnesses so they can corral any possible outbreak.

n. + center >>共 396
dispute 6.25%
talk 5.41%
speculation 5.10%
debate 4.65%
discussion 3.05%
case 2.74%
investigation 2.59%
concern 1.75%
question 1.60%
story 1.29%
federal 0.99%
federal + v. >>共 28
center 17.33%
judge 13.33%
fund 10.67%
court 9.33%
appeal 5.33%
charge 4.00%
law 4.00%
mandate 4.00%
program 4.00%
be 2.67%
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