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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单项选择题

A．send offB．relieve offC．give offD．set off

A．send off
B．relieve off
C．give off
D．set off

单项选择题

We learn from the second paragraph, ______.

A．reducing cost is the surest way to increase profits
B．profits depend on how fast goods are moving
C．fair markup promise the greatest profits
D．lower markup brings reasonable profits