逆转录酶催化的反应是 、 、 以 为模板合成第二条 DNA 互补链。
“We shall know a word by the company it keeps.” This statement represents _______.
A. the conceptualist view
B. contexutalism
C. the naming theory
D. behaviorism
Words that are close in meaning are called ______________.
A. homonyms
B. polysemies
C. hyponyms
D. synonyms