</p> 第4部分:阅读理解(第31-45题,每题3分,共45分)+ V; U% e! w5 Q0 q3 @
下面有3篇短文,每篇短文后有5道题。请根据短文内容,为每题确定1个最佳选项。& ?2 x- A: w1 y" t3 B- `) a$ k& q
第一篇& u& c, ?$ V/ U
Walking to Exercise the Brain
2 y4 U ? }$ {. O8 z Do you think sitting and studying all the time will improve your grades?Think again.Getting some exercise may help,too.
/ s8 h; a( f; T New research with older people suggests that taking regular walks helps them pay attention better than if they didn't exercise.7 H9 \8 G5 U2 t. o, k' ]7 Q
Previous research had shown that mice learn,remember,and pay attention better after a few weeks of working out on a running wheel.Mice that exercise have greater blood flow to the brain than those who don't.Their brain cells also make more connections.
: @4 m/ n/ [8 Z Neuroscientists from the University at Urbana-Champaign wanted to find out if the same thing is true for people.First,they measured the physical fitness of 41 adults,ages 58 to 77,after each per-son walked 1 mile.Then,participants looked at arrows on a computer sczeen and had to use com-puter keys to show which way one particular arrow was pointing.
7 Z) ]5 L$ |/ G8 N# x Adults who were physically fit were faster at the arrow task,and their answers were just as ac- curate as their less-fit peers,the researchers found.The fitter participants also had more blood flow to a part of their brain responsible for paying attention and making decisions., e" ~2 v6 A# n4 Q
In a second study,15 elderly people who completed a 6-month aerobic-training course were fas-ter at attention tasks compared with 14 seniors who just did stretching and toning exercises for the same amount of time.8 t2 K# Q5 t2 {- K- V8 { j! A, g
So,even going for a walk every 2 or 3 days forjust 10 to 45 minutes can help.That should be good news for your grandparents.
" @$ f( [8 q7 l% J! J The effects of exercising on the brains of younger people haven't been studied yet.Still,it can't hurt to take occasional study breaks and go for a walk or run around with your friends.You might even do better in school.2 a0 P/ ~# r @/ U$ \& \
Whatever you do,though,don't try to read and walk at the same time.You could end up hurting yourseff!
: q! d& O' `: }3 I 31.Walking regularly helps elderly people_______.) G* x* O3 h0 W1 ]. q- f E& A
A.lose weight
+ W7 T' e( \" J& i B B.become happier
% f% p! L8 r' c8 F r/ k) U C.concentrate better
a+ s- }0 A, E5 M& l4 H D.look younger
" q g- d k6 x0 J2 o 32.After taking exercise for a few weeks,the mice were found to have_____.
( n$ a0 W% i! |, W A.higher blood pressure
7 E9 I1 D; h* c, [) d. _# \& F B.faster heartbeat
, b9 x" p6 l! n1 l C.more blood flow to the brain
# z* |9 ]9 M' ?6 ^3 D D.better appearance
. S6 |, H; i/ N2 h. F0 C" h 33.The first study on 41 elderly people found______.
& T. \) A3 R& B: H- a# p; n A.the less-fit participants did arrow tasks faster
4 ?4 {! }. ?. i* D$ Q; C$ ^ B.the fitter participants did arrow tasks faster/ y6 P: Q, z6 G
C.the less-fit participants gave more accurate answers
6 r5 _3 m7 j2 E7 t: H8 R D.the fitter participants gave more accurate answers9 s e! e) W$ }1 Q* y. ^
34.It can be good for health when one takes a walk every 2 or 3 days for at least______.7 Y, U6 h: `6 O$ I* f5 P
A.3 minutes
, J% T2 t* ?3 f B.45 minutes
" W) E `; L: B C.30 minutes2 G! A+ [ ?0 j$ A, y2 L
D.10 minutes2 N1 i; n f# a% v" q' }" C* H
35.It is suggested in the last paragraph that people should______.
2 ] I; H7 x; m A.run around once a week
( e! x) G+ S+ |' |/ {7 \3 m& ?2 H B.not read and walk at the same time
7 g9 W/ x7 C* Q$ a+ Q% J C.go for a walk every day$ b. q/ J/ n" C |# O
D.not hurt their friends while exercising |