________ these experiments are interesting and useful, it is important to remember tha
A.When
B.While
C.Unless
D.Until
A.When
B.While
C.Unless
D.Until
______ (尽管困难重重), they continued their experiments and made great discoveries in the end.
The results of the experiments have shown that common courtesies ______.
A.are still with us
B.are disappearing
C.vary with professions
D.needs rigorous study
Some of the experiments _____ in our textbook are difficult to perform.
A.to describe
B.be described
C.describing
D.described
A.transferred
B.terminated
C.testified
D.transformed
Machover's experiments on digital music are for the following purposes EXCEPT
A.creation of new types of musical instruments.
B.participation of people in making music.
C.improvement of current computer technology.
D.convenience in making unique music.
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