理工类：词汇选项characteristic
1 Ambition is a characteristic of all successful businessmen.
A factor
B feature
C sign
D symbol
2 All living organisms， regardless of their unique identity， have certain biological， chemic and physical characteristics in common.
A as result of
B considering
C on purpose
D whatever
3 The immense change of the city astonished every member of the conference.
A surprised
B interested
C bored
D excited
4 The nursery is bright and cheerful.
A pleasant
B colorful
C fashionable
D unforgettable
5 Practically all species of animals communicate either through sounds or through a large repertory of soundless codes.
A Simultaneously
B Almost
C Absolutely
D Basically
6 Many fine cooks insist on ingredients of the highest quality.
A demand
B rely on
C prepare for
D create
7 While attempting to find a new route to India， Columbus discovered America by accident.
A sailing
B failing
C trying
D hoping
8 We want to know his family background.
A relationships
B members
C troubles
D income