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【单选题】
产品销售量达到顶峰并开始下降,利润稳中有降,是产品生命周期()阶段的特征。A.
引入期
B.
成长期
C.
成熟期
D.
衰退期
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反馈参考答案：
举一反三
【单选题】当需要评价某人的科研学术成就，评价某种期刊的质量，评价某一组织机构的科研水平时，应尽可能采用()进行检索。
A.
电子期刊全文数据库
B.
引文数据库
C.
电子书
D.
文摘数据库
【单选题】I had to buy of these books because I didn’t know which one was the best.
A.
both
B.
none
C.
neither
D.
all
【单选题】I didn’t know the new word in the text, so I had to the word in a dictionary.
A.
look out
B.
consult
C.
refer to
D.
look up
【单选题】当需要评价某人的科研学术成就,评价某种期刊的质量,评价某一组织机构的科研水平时,应尽可能采用()进行检索
A.
电子期刊全文数据库
B.
引文数据库
C.
电子书
D.
文摘数据库
E.
综述
【单选题】I sooner but I didn’t know that they were waiting for me.
A.
had come
B.
was coming
C.
would come
D.
would have come
【单选题】I didn’t know the word. I had to _______ a dictionary.
A.
look out
B.
make out
C.
refer to
D.
go over
【简答题】I had to buy all these books because I didn’t know which one was the best.
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