tailieunhanh - Mastering skills for the toefl ibt advanced part 18

Many government agencies as well as multinational corporations require applicants to submit TOEFL® scores. Even English-teaching institutes may request TOEFL8 scores in order to place students at the appropriate level of instruction. | of the amoeba. These were hot private wells but rather high-volume . T-T i public wells run by private water companies and municipal facilities. The researchers also found that a certain kind of bacteria called -YY heterotrophic bacteria was present in the water. These bacteria served as food for N. fowled allowing them to propagate in water supplies that were usually free of such bacteria and thus free of N. fowled The researchers concluded that the presence of these bacteria allowed N. fowled to invade the municipal water supplies. They also discovered that N. fowled is very resistant to the purification treatments common in municipal treatment plants including treatment with chlorine. Yyx- . . Therefore the treatments widely used to remove harmful organisms from water were futile against N. fowled. In an experiment by Detterline and Wilhelm the presence of N. fowled X . 7. .-Y in government-owned recreational waters was linked with changes in the environment. Fifty-nine sites were tested for N. fowled of which thirty-four tested positive. These sites include Yosemite Creek of Yosemite National Park and other federal water sources throughout the United States. The investigation found that the presence of this amoeba . was highly correlated with environmental disturbances such as unnaturally high iron content usually due. to limited outlets disruptions --y in biodiversity land clearings or fluctuations in water temperatures. The experiment found that the amoeba was especially tolerant of waters above twenty-six degrees Celsius. Thus the amoeba s presence can be connected to the increase in water temperatures across the United States as global warming continues to alter ecosystems. Naeglena fowled 120 Chapters P Ä - 21. The word sharp1in the passage is closest 3. The word contaminated jin the passage is - in meaning to . A thin . B pointed C violent D sudden closest in meaning to A stopped B increased C infected D destroyed . 2 T S 3 is W The word g gjffiiS in the