[单项选择]下列与混凝沉淀工艺运行管理不相关的内容是（）。
A. 污泥处理
B. 定期对沉淀池进行清理
C. 定期对药液溶解池进行清理
D. 排渣操作

It may not have generated much interest outside energy and investment circles, but a recent comment by Tidewater, Inc. president Dean Taylor sent earthquakes through the New Orleans business community. In June, Taylor told the Houston Chronicle that the international marine services company—the world’s largest operator of ships serving the offshore oil industry—was seriously considering moving its headquarters, along with scores of administrative jobs, from the Crescent City to Houston. "We have a lot of sympathy for the city," Taylor said. "But our shareholders don’t pay us to have sympathy. They pay us to have results for them."
It was the last thing the hurricane-scarred city needed to hear. Tidewater was founded here a little more than 50 years ago, and kept its main office in New Orleans throughout the oil bust of the 1980s and the following decades of industry consolidation, when dozens of energy firms all but abandoned Ne
A. is often struck by hurricanes such as Katrina
B. no longer paid white collars as much as before
C. failed to recover from the storm as planned
D. will lose more while-collar jobs in oil industry after the storm

Research on animal intelligence always makes us wonder just how smart humans are. (1) the fruit-fly experiments described by Carl Zimmer in the Science Times. Fruit flies who were taught to be smarter than the average fruit fly (2) to live shorter lives. This suggests that (3) bulbs burn longer, that there is a(n) (4) in not being too bright.
Intelligence, it (5) , is a high-priced option. It takes more upkeep, burns more fuel and is slow (6) the starting line because it depends on learning — a(n) (7) process — instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to (8) .
Is there an adaptive value to (9) intelligence That’s the question behind this new research. Instead of casting a wistful glance (10) at all the species we’ve left in the dust I.Q.-wise, it implicitly asks what the real (11) A. insists on
B. sums up
C. turns out
D. puts forward