单项选择题

In lens design,______.

A．it is completely impossible to preset the best steps along the way
B．it is always very hard to solve any problems
C．one can work out a best solution to problems in each step
D．there are countless steps towards the final goal

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热门试题

单项选择题

The passage is mainly about______.

A．the importance of revising
B．the importance of writing
C．how to compose good writing
D．how to revise your writing

单项选择题

Which of the following is not true according to the text

A．Revising can be described as the most important part of writing.
B．Writing to learn and writing to show learning are never entirely separate processes.
C．Revising takes many forms.
D．There is no differences between writing to learn and writing.