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【判断题】
一棵语法树是不同推导过程的共性抽象。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】At no time does the salesgirl get up late in the morning, for she is always too busy _____ a good rest.
A.
to take
B.
taking
C.
took
D.
taken
【单选题】'Though it is difficult to remember now, this was not always the case.' In the 1st paragragh, this sentence suggests that ______.
A.
today Google has become a commonplace way to find information online
B.
Google made a great contribution to searching online
C.
Google changed a lot
D.
Google is different from other search engines
【简答题】茶叶系统分类法的主要分类依据是( )、( )和( )。
【简答题】We’re always busy with our work. We seldom have _________________________ .
【简答题】9 A: Are you busy
at work right now? B: Yes. We're always busy in November. But ____ month will be slow
because of the holidays.
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