单项选择题
A．The surplus generated by low-pressure systems can be sold, lessening overall water strain on a region.
B．Low-pressure systems deliver water directly to root systems, resulting in higher crop yields.
C．A lower cost is associated with low-pressure systems than with high-pressure systems, which are generally more expensive.
D．Lower-pressure systems deliver water in such a way that evaporation rates are diminished, resulting in greater efficiency.
E．Crops watered by lower-pressure systems generally contain higher nutrients, reducing overall food consumption levels.
单项选择题 Most nearly parallel, in its fundamental approach to the drip system solution described in the passage would be a machine designed to（）
单项选择题 According to the passage, the main disadvantage with reconfiguring diet to lessen water usage is（）
单项选择题 The passage suggests that the author would most probably agree with which of the following assessments of optical computing in its present form（）