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【简答题】
Doves flying in daylight use the sun for guidance. But the stars are obviously their most important means of navigation. They find their way by such landmarks as mountains ranges, coastlines, and river courses. When it is too dark to see these, the doves circle helplessly, unable to get their bearings.
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刷刷题刷刷变学霸
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【单选题】Text 2 Of all the truths that this generation of Americans hold self-evident, few are more deeply embedded in the national psyche than the maxim "It pays to go to collage." Since the Gl ...
A.
Going to college is necessary.
B.
Going to college has become ordinary.
C.
Going to college is a civil right.
D.
Going to college is expensive.
【单选题】Beads were probably the first durable ornaments humans possessed, and the intimate relationship they had with their owners is reflected in the fact that beads are among the most common items found in ...
A.
Anthropologists.
B.
Agricultural experts.
C.
Medical researchers.
D.
Economists.
【单选题】以上属中暑痉挛的是
A.
常见于老年人，体温超过41℃、脉细数、意识障碍、无汗
B.
多见于青壮年人，大汗、乏力、腓肠肌痉挛
C.
大汗、头昏、恶心、呕吐、面色苍白、皮肤湿冷、脉搏细速、血压下降、甚至昏迷
D.
在烈日下暴晒过后，出现剧烈头痛、眼花、烦躁，严重时出现惊厥
E.
呕吐、腹泻、乏力