单项选择题
Human beings have ______themselves to very diverse environments with the help of fire, agriculture and machines.
单项选择题 The people in the snow-stricken areas need much more food than ______to them by the airforce.
单项选择题 It is not the first time that I ______by him during my cooperation with him.
单项选择题 Her sharp _____of the film in the paper this morning gave rise to a hot discussion.
