2x+y-5=0
2y-x-3=0
2x+y-4=0
2x-y=0
第1题:
whenever
whatever
however
wherever
第2题:
充分但不必要条件
必要但不充分条件
不充分也不必要条件
充要条件
第3题:
them
this
it
that
第4题:
delay
delaying
to delay
to be delayed
第5题:
hoped
told
let
wished
第6题:
play
exercise
agree
discuss
第7题:
London Zoo told them what kind of snake it was
Mr. Jackson sent the photo to the hospital
he left hospital the next day
the snake bit him
第8题:
第9题:
artificial
wild
manual
fake
第10题:
speak
answer
say
ask
第11题:
one
two
three
four
第12题:
days
weeks
months
years
第13题:
mustn’t
can’t
shouldn’t
needn’t
第14题:
possible
likely
maybe
probable
第15题:
which
which of
whose
with
第16题:
充分不必要条件
必要不充分条件
充要条件
既不充分也不必要条件
第17题:
would
should
must
ought to
第18题:
talk to
look after
worry about
ask for
第19题:
which
what
that
who
第20题:
when
that
which
what
第21题:
So fast he ran
So fast did he run
So fast ran he
Such fast did he run
第22题:
handling
handled
to handle
handle
第23题:
Thanks to
Thanks for
For
Under
第24题:
the; the
the; an
a; the
a; an