练习一
present
since
doctor
pollution
open
DABAC BBADB
has taught
married
swim
came have been
have lived was
练习二
changes
seen
in fact
marry
southern
enjoyed ourselves
won’t until
have been married
has kept
different from
AADBD ABB
练习三
possible
service
although
attraction
present
have since
How many
When buy
Have carried
got → been
didn’t → hasn’t
sadly → sad
but → /
already → yet
next to
has been opened
any more
how to get
It’s to read
There are came
but came
have known
are interested in
练习四
CBACD B
not arrived yet
How long been
How long heard
Has ever been
Has changed yet
I have lived here since I was born
It’s happy to play Chinese chess with my classmates
Though Tom was ill, he went to school
Where’s Mary? She has gone to the cinema
Have you ever been to Beijing? Yes. I have been there
I used to play computer games, but now I’m not
练习五
a theme park
fast-food
wave to us
get married
during the summer holiday
at a high speed
feel exciting
a whole day
go touring
wait for an hour
stop taking photos
have/has gone to Shanghai
have/has been to Shanghai
on the second day
careful carefully
helpful helpfully
hopeful hopefully
wonderful wonderfully
noisy noisily
healthy healthily
lucky luckily
shiny 不知道
impolite
impossible
unkind
unpleasant
cheerless
harmful
different
present
although
lovely
present
pleasant
sure
go back
performer
sail
development
closer
education
feeling
discusser
meaning
练习六
have seen saw
were doing was helping do
was watching knocking
made stop to read
Was dancing
not to take
were clapping were marching
The souvenirs are so expensive that I can’t buy them
He has enough money to travel around the world
What were you doing when he arrived
Daniel was swimming in the lake at noon yesterday
unnecessary
delightful
as
fat
Italy
happy
meaning
excited shouted
练习七
out
morning
called
office
surprised
tickets
back
cinema
themselves
thieved
CDCAC BACBA
练习八
has been away from Shanghai for two days
couldn’t stop taking photos with them, because they looked very cute
have been in Hong Kong for a week
have been to Hong Kong twice
has already gone to Hong Kong been away for two days
is quite different from it in Beijing
never forget this meaningful experience
did you come back from Hong Kong arrived the day before yesterday,I have already been back for two days
作文略
练习九
information
change
enjoy
screen
online
start
restart
is designed by
e-dog for
wasn’t night
has lived for
important
used
to go
sold
more
libraries
made
will replace
pleasant
to buy
练习十
ABBCD ADA
funny
printer
designed
looking
written
correctly
educational knowledge
passed
at the same time
come out
send e-mails
get scores
order a package on the Internet
different clouds
play the role of
have a dream
many places of interest
be sold out
search for information
a remote control
word processing
a ten-year-old boy
play the role of
fall asleep
use widely
double click on the icon of
What do you usually used computer for
The computers are designed for the students
What do you want to buy I want to buy a personal computer
She will help you if necessary
练习十一
was left
is double clicked
was produced
is put
keep
BCDBA
练习十二
levels
character
uses
village
jump
goal
ask
knowledge
need
designed
written
start
has worked
is caught
are marked
typing
was broken
was lost
was made
is used
be clicked
Party things: cake chocolate Coke iced tea orange juice biscuit sweet chip
Stationary: pen ruler desk
Electrical appliances: computer air-conditioner e-dictionary television radio
暑假作业数学答案
练习一
BAABA B
=-0.5 =0.5
a-b -2 a^3-a^2b
19:13
60x^2 y^2
Y=x - a分之3
练习二
DCCDA
12
3。068×10^7
-3.48×10^-5
2
10
3 7
练习三
X≥1且≠2
(-1,2)
Y=12+2x
-2＜x＜-0.5
三
DCCCA
练习四
BBCCA A
y=x+5
-2
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