He, a Nobelist, made great ______________ to researching in this area.
#5814
A
encouragements
B
constitutions
C
breakthrough
D
contributions
推荐题目
The success of her business made it difficult for her to carry out her as wife and mother.
#7165
A
model
B
example
C
work
D
role
Most air pollution is caused by the burning of _________ like coal, gas and oil.
#7133
A
fuels
B
articles
C
goods
D
products
Fortunately, with the help of some local villagers, rescuers were able to gain ________ to the disaster-hit area soon enough.
#6013
A
track
B
access
C
means
D
passage