Scientists have found no ________of life on Mars so far,though great efforts have made on the research.
#7179
A
symbols
B
signs
C
marks
D
signals
推荐题目
It was not easy for him to buy good shoes because he had such a big _____ of feet.
#6751
A
couple
B
size
C
number
D
pair
One of the most famous tourist_____ in Oxford is Christ Church.
#7410
A
views
B
scenes
C
sites
D
sights
一Tell us, Mark ,what is the ____ of the American Civil War?一 Well, is it because the black slaves wanted freedom?
#6280
A
effect
B
cause
C
result
D
reason
The map was drawn to the standard _____ of 1/100,000, so there was not much detail.
#6925
A
route
B
line
C
rate
D
scale