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问题 选择题

在百米赛跑比赛中，测得一优秀运动员在5s末的速度为7m/s，10s末到达终点时的速度为11m/s，则他全程的平均速度为（　　）

A．7m/s

B．9m/s

C．10m/s

D．5.5m/s

答案

由题义可知，位移x=100m，所用时间t=10s，所以平均速度

.
v
=
x
t
=
100m
10s
=10m/s．选项ABD错误，C正确

故选C．

判断题

汇兑一般用于同城范围或同一票据交换区域内的结算，异地间的结算不使用汇兑结算。
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阅读理解
在l-5题中，Ronald, Versa, Rosalind, Clarence和 Tracy正各计划买一本书。阅读下面六本书的介绍
(选项A、B、C、D、E、F)，选出符合各自要求的最佳选项。选项中有一项是多余选项。
     ____1. Ronald is an African-American student who is very hard-working at all his subjects especially in
American history. He is eager to know the whole history of the USA and wishes to get an ideal book to realize
his dream.
     ____2. Versa used to be ill in hospital for quite some time and therefore has great difficulty with his studies.
He can't even understand what his teachers say in class. Therefore, he is in great need of a valuable book to
give him a hand.
     ____3. It's only two months before Rosalind's mother's birthday comes. Deeply loving her mother, Rosalind
is to give her a great surprise by cooking a rich and delicious birthday dinner for her. As she is now poor in
cooking, she needs a book for her purpose.
     ____4. Clarence aims at entering a leading university. To his great pity, high grades seem still a long way
from him even though he has devoted most of his energy and time to his lessons. How he wishes to get a book
for good tips on studying and time management!
     ____5. Tracy is good at music and drawing and is thought to be gifted in art. She herself also has decided
to work herself towards this direction. Only natural talent and ideas are not enough. She still needs some other
help besides that from teachers. She wants to buy a book which meets her need.
                                                                  A
     This is the only book that offers valuable study guide designed by experienced teachers.
                                                                  B
     This is one of the most popular and effective American history textbook, tracing the
history of the United States from the arrival of first Indian people to the present day. It
includes numerous interesting history stories.
                                                                 C
     This book is designed as a 12-week program in memory of an artist. The author
introduces the artist's dates and others tools. Each week follows a particular theme. The
12 weeks described in the Artists Studios are: safety, power, honesty, connection, strength,
self-protection, independence, faith and so on.
                                                                 D
     This book just tells stories of how people cook at a particular point in time. It is a
must-have in your kitchen. It is the excellent reference guide that you want to use for
years.
                                                                 E
     This book encourages students and weaknesses, and causes them to recognize themselves in ways they probably haven't thought before, It is really helpful to those who have difficulty with studying and time management.
                                                                 F
     This is the most widely used music textbooks that presents a solid foundation in musical
theory while conveying the importance of music in life. It helps students understand
essential roles of music in other fields.
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