| 请根据下面短文回答题： The trip to the Mystery Caves will take place on Sunday, 27 July. You can book your tickets in Room 188 between 2:30 p.m. every day. Your parents should confirm (确 认) the booking by writing to us as soon as possible. You should pay for the trip before 21 July. If we do not receive your money early enough, your booking will be cancelled (取消) . If the trip does not take place for any reason, your money will be paid back. We are planning to meet outside the railway station on Black Street at 8:00 a.m. It will take us about 2 hours to get to the center of the town by train, and from there we have to catch a bus. It will take another hour to get to the Mystery Caves on the bus. We will spend about 1 hour and half visiting the caves (山洞) , and we hope to catch the 1:30 bus to Happy Lake for some swimming. If we are [单选题]具有滋阴润燥的清热泻火药是:( )
A.芦根 B.天花粉 C.栀子 D.知母 E.淡竹叶 [多项选择]开展农村土地权属调查应充分利用以往确权资料和调查成果，并应该掌握的基本原则有（）。
A. 延用性原则 B. 完善性原则 C. 重新确权原则 D. 继承性原则 E. 统一要求原则 [简答题]简述可编程控制器PLC系统经常需要检查和维护的项目及其内容。
[多选题]工作票签发人可由哪些人员担任？（ ）
A.工区材料员 B.工区安全员 C.所主任 D.技术人员 [单项选择]Humans are forever forgetting that they can’t control nature. Exactly 20 years ago, a magazine cover story announced that "scientists are on the verge of being able to predict the time, place and even the size of earthquakes". The people of quake-ruined Kobe learned last week how wrong that assertion was.
None of the methods praised two decades ago have succeeded. Even now, scientists have yet to discover a uniform warning signal that precedes all quakes, let alone any sign that would tell whether the coming quake is mild or killer. Earthquake formation can be triggered by many factors, says Hiroo Kanamori, a seismologist (地震学家) at the California Institute of Technology. So, finding one all-purpose warning sign is impossible. One reason: Quakes start deep in the earth, so scientist can’t study them directly. If a quake precursor (预兆) were found, it would still be impossible to warn humans in advance of all dangerous quakes. Places like Japan and California are filled with A. well-erected structures do not collapse B. the existent quake-resistant buildings need to be redesigned C. steel-frame buildings survive any earthquakes D. seismic (地震的) engineering has improved well enough for structures to resist quakes 我来回答: 提交
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