B.faster heartbeat
C.more blood flow to the brain
D.better appearance
33.The first study on 41 elderly people found______.
A.the less-fit participants did arrow tasks faster
B.the fitter participants did arrow tasks faster
C.the less-fit participants gave more accurate answers
D.the fitter participants gave more accurate answers
34.It can be good for health when one takes a walk every 2 or 3 days for at least______.
A.3 minutes
B.45 minutes
C.30 minutes
D.10 minutes
35.It is suggested in the last paragraph that people should______.
A.run around once a week
B.not read and walk at the same time
C.go for a walk every day
D.not hurt their friends while exercising
第二篇
Night of the Living Ants
When an ant dies,other ants move the dead insect out of the nest.This behavior is interesting to scientists,who wonder how ants know for sure and so soon that another ant is dead.
Dong-Hwan Choe,a scientist at the University of California found that Argentine ants have a chemical on the outside of their bodies that signals to other ants.m dead.take me away.
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