for their movement to be observed during a single human lifetime. 100. Being mitted toa course of action, especially one that has worked well in the past, is likely to make an executive miss signs of incipient trouble or misinterpret them when they do appear. 101. As rainfall began to decrease in the Southwest about the middle of the twelfth century, most of the Monument Valley Anasazi abandoned their homes to join other clans whose access to water was less limited . 102. Y ellow jackets number among the 900 or so species of the world ’s social wasps, wasps that live ina highly cooperative anized society consisting almost entirely of females ------ the queen and her sterile ( 不育的,贫瘠的) female workers. 103. El Nino, the periodic abnormal warming of the sea surface off Peru, isa phenomenon in
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