The National Institute of Health is discussing ways of tackling the problem of childhood（）.

单项选择题To （）how the system works，Bruce shows off the prototype of a 3D analysis tool.

A.dedicate
B.distribute
C.demonstrate
D.cultivate

单项选择题We’re firmly（）to the manager’s latest decision to expand overseas market.

A.obtained
B.deleted
C.preserved
D.opposed

单项选择题Mozart had an incredible capacity to（）other individuals，their facial gestures，their dialects.

A.intimidate
B.immigrate
C.imitate
D.intimate

单项选择题Citric acid can be （）from the juice of oranges，lemons，limes or grapefruit.

A.extracted
B.emerged
C.posted
D.submerged

单项选择题When King George（），his brother succeeded him on the throne.

A.abdicated
B.addicted
C.appointed
D.appraised