High-speed trains travel at 300 kilometers an hour，which is about normal trains．
#14190
A
four times the speed as
B
the speed four times of
C
four times as the speed of
D
four times the speed of
推荐题目
I soon found that the work I was doing had already been done by someone else.________，I was wasting my time.
#12810
A
In other words
B
In a word
C
First of all
D
Believe it or not
(2013·北京高考)When we saw the road ________ with snow, we decided to spend the holiday at home.
#11366
A
block
B
to block
C
blocking
D
blocked
---Did he say something in the lecture that ______you?----Not really, Actually I felt sleepy over his speech.
#13305
A
adjust to
B
attached to
C
appealed to
D
referred to
To protect the environment, the local government has put up a lot of ______ to warn the citizens not to litter the ground.
#11232
A
sighs
B
sights
C
signals
D
signs
He is always full of _______ as though he never knew tiredness.
#12943
A
strength
B
power
C
force
D
energy