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系统论是指什么？

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模象直观是指什么？

We are making you our quotation for shoes ____.

A. as follows
B. as following
C. as follow
D. followin

We look forward to ____ trial order.

A. receiving your
B. receive from you
C. receipt your
D. receip

We have made ____ that we would acceptterms for your present order.

A. clear
B. it is clear
C. that clear
D. it clea