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【多选题】
Which of these followings are notions?A.
P resent time, past time, and future time
B.
C ertainty and possibility
C.
A gent and instrument;
D.
R elationship between people and objects
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举一反三
【单选题】I didn’t tell him ______ news at once because I wanted to give him surprise.
A.
a, a
B.
the, the
C.
the, a
D.
/, the
【简答题】放大电路交流负反馈有四种基本组态，欲稳定放大器的输出电流I0，同时增大放大器的输入电阻Ri，应当引入（ ）负反馈。
【单选题】--Must I don’t at once? --No,____.
A.
you mustn’t
B.
you can’t
C.
you won’t
D.
you don’t have to
【单选题】I hadn't seen her for 10 years, but I ____ her at once.
A.
realized
B.
recognized
C.
knew
D.
found