If metal is heated and then cooled very quickly, , by dipping in cold water, it will be very hard but will break easily.
#91782
A
what’s more
B
in general
C
for example
D
on the other hand
推荐题目
_____，let's exchange our ideas on how to spend the holiday.
#91825
A
Starting with
B
Start with
C
To start with
D
To start
A giant helium(氦) balloon is telling residents of Paris how good or bad the air quality is. When it’s good, the balloon ----measuring 22 meters wide and 32 meters high---shines green. _________, it’s red.
#91781
A
Though terrible
B
Whenever good
C
If worse
D
When bad
________，people in the south like rice while people in the north like wheat.
#91759
A
In general
B
In common
C
To be honest
D
Worse still
--What happened to you on your way back to the hotel last night? --I lost my way in complete darkness and, _________ things worse,it was pouring with rain.
#91830
A
making
B
to make
C
having made
D
made
It is thought that one billion people I the world,________is half the word’s workers, earn their living by farming.
#91820
A
if
B
that
C
which
D
what