单项选择题

24. To our ____, they completed the project on time despite all the difficulties involved.
A、annoyance
B、amazement
C、disappointment
D、embarrassment

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From the beginning of the project, the landscape architect felt strongly that a water f________ would unify the courtyard.
问答题
黑白图像或灰度图像只有__个位平面,彩色图像有3个或更多的位平面。
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