No computer can（）the complex functions of the human brain.

单项选择题Senior citizens want a more comfortable and （）future.

A.secure
B.violent
C.magnificent
D.possessive

单项选择题I looked forward to the （）of their theories.

A.exploitation
B.extinguisher
C.exploration
D.expense

单项选择题Our challenge is to（）those voters and inspire them to join our cause.

A.demonstrate
B.imitate
C.motivate
D.illustrate

单项选择题Forests provides （）materials for human activities.

A.crude
B.coarse
C.rough
D.raw

单项选择题Retailers will need to rethink their strategies as（）shoppers demand price-competitive goods.

A.thrifty
B.moist
C.barren
D.digestive