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【单选题】
阅读理解，请选择正确的答案。The basic components (构成) of a typical chemical process are shown in Fig. 1, in which each block (方框) represents (代表) a stage in the overall (全部) process for producing a product from the raw materials. Fig. 1 represents a generalized (一般的) process; not all stages will be needed for any particular process and the complexity (复杂程度) of each stage will depend on the nature of the process.This paragraph implies that ( )A.
Figure 1 represents particular process.
B.
each block in Fig.1 represents a stage of particular process.
C.
the complexity of each stage will depend on the cost.
D.
not all stages in Fig.1 are included in every chemical process.
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