We should never ourselves with book knowledge only.
A. content
B. contract
C. contrast
D. Contain
网友回答
A. content
B. contract
C. contrast
D. Contain
解析:考查动词;A. Content使...满足,content onesef with对 ...很满意,B. contract缩小;订合同;C. Contrast对比D. Contain包括,句意是:我们不该只满足于书本知识。选A。