题目内容：
根据以下资料，回答题：The proportion of adults who said they went on a 10-minute walk at ]east once a week increased to 62 percent in 2010, from 56 percent in 2005, the Centers for Disease Control and Prevention (CDC. Ires reported.
Federal guidelines 36 that adults get at least 150 minutes of moderate.- intensity aerobic (有氧的) exercise (like quick walking) or 75 minutes of 37 exercise (like running) each week, The 38 of people who met federal guidelines for aerobic exercise also grew, to 48 percent in 2010 from 42 percent in 2005, the agency said.
"We know that walking is one of the most popular 39 activities that people do," said Dianna Carroll, a CDC epidemiologist (流行病学家) who 40 to the study.
Walking increased across all races, ages and 41 . The South showed the biggest increase in people who said they walked during the study period, 42 to 57 percent from 49 percent in 2005. The Northeast showed the smallest increase, to 66 percent from 64 percent.
n the CDC's National Health Interview Survey, more than 20,000 people were asked to 43 how much they had walked in the previous seven days. The study excluded people who said they could not walk.
Dr. Carroll said that Americans could still 44 "We have this increase in walking, but less than half of adults are getting enough activity to show 45 health benefits," she said.
A. advise
B. contributed
C. countries
D. devoted
E. dramatically
F. improve
G. largely
H. physical
I. proportion
J. recall
K. recommend
L. regions
M. remember
N. substantial
O. vigorous
36._________
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