After the tent stakes are arranged in a row, like ones in fig. 289, adjust the forks of the uprights two inches from the ends of the ridge pole (fig. 288), then make fast the two extreme guy ropes a and b to tent pegs; the others are unimportant for the present, after that, raise one tent pole part the way up (fig. a)the text structure is compare and contrast; words like unimportant and ridge poles indicate this. b)the text structure is sequence; words like after and then indicate this. c)the text structure is chronological; words like end and present indicate this. d)the text structure is cause and effect; words like after and present indicate this.   

B. The text structure is sequence; words like after and then indicate this.

Explanation:

The text structure in the given passage follows an organizational mode that follows a sequence that suggests the actions one after another. The use of words 'after and then' compliments the order of the arrangements to reach a final product(tent here). The authors use the sequential text structure to provide a more coordinated and formulated structure to the content. The given sentences exemplify a procedure that is to be done in sequence, thus, the author has employed the sequential structure.

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1. c. zone of saturation, water table, zone of aeration

2. c. condensation

3. b.   conservation and condensation

4. c. groundwater dips below the water table in an artesian well

5. d. oceans

6. c. geyser

7. d. groundwater

8. b. 70%

9. d. transpiration

10. c.   desalination