Unit 1 Great Scientists(60 分钟 巩固训练)一、单项选择 (共 15 小题,每小题 1 分, 满分 15 分
The invention of steam engine greatly sped up the industrial revolution, which _____ a lot to the take-off of the world
contributed C
constructed D
exposed 2
From my point of view, the theory that ______ by the scientist is not quite scientific
was risen B
brought up C
had been raised D
was put forward 3
It is clear that no use can be made ______radium _____ we don’t know clearly the characteristics of it
from; if B
of; unless C
from; unless D
of; if 4
We have to ______ everything question in detail ______ we take action
conclude; before B
make analysis of; when C
expose; until D
analyze; before 5
It will be many years ______the doctors and medical scientists can find _____ for canc