3． Why do researchers develop a new device to monitor signs of landsides?
A Because the new device can measure the site directly．
B Because the new device can be sunk into boreholes or fixed above ground．
C Because the common methods can cause false alarms．
D Because the common methods are useless．
4． Which of the following statements is NOT true of the device，according 1o Paragraph4?
A It is filled in with gravel．
B It consists of a steel pipe．
C It is dropped into a horehole filled in with gravel．
D It is connected to a sensor on the surface．
5． According to the context，what does the word “positives” in the fifth paragraph mean?
A Positive electric charges．
B Evidences．
C Warnings．
D Predictions．
答案與題解：
1． D 短文第一段的第一句告訴我們，英國(guó)研究人員正在測(cè)試一種儀器，這種儀器可以通過(guò)監(jiān)測(cè)土壤的振動(dòng)來(lái)預(yù)警山崩。該段最后一句說(shuō)，這種災(zāi)難經(jīng)常在一些遭受自然災(zāi)害的國(guó)家發(fā)生，這些自然災(zāi)害包括sudden，heavy rainfall和earthquakes以及water erosion.所以D是正確選擇。
2． D A、B、C的內(nèi)容都可在第二段中找到。所以D是正確答案。
3． C 第三段的第一和第二句告訴我們，最為普通的監(jiān)測(cè)山崩方法是對(duì)山坡形狀變化的觀察，有兩種觀察方式；第三句說(shuō)，因?yàn)樯狡滦螤畹淖兓灰欢▽?dǎo)致山崩，所以兩種方法都會(huì)有虛假的預(yù)警。因此，C是正確答案。
4． A B、C、D所述內(nèi)容都可在第四段中找到。The borehole is filled in with gravel around the pipe．在被鑿出的洞里填充沙礫，圍在鋼管四周。不是在鋼管里填充沙礫。所以A是錯(cuò)誤的說(shuō)法，是正確的選擇。
5． B positives在此用作名詞，意思是：被證實(shí)的因素或特點(diǎn)，可以理解為證據(jù)。