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41. What does "Such natural disasters" in the first paragraph refer to?
A Sudden, heavy rainfall.
B Earthquakes.
C Water erosion.
D Landslides.
42. Which of the following statements is true of landslides?
A The initial movement is hard to spot.
B They start with a movement of a few particles of soil or rock.
C They can be destructive in a matter of hours or minutes.
D All of the above.
43. 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.
44. Which of the following statements is NOT true of the device, according to Paragraph 4?
A It is filled in with gravel.
B It consists of a steel pipe.
C It is dropped into a borehole filled in with gravel.
D It is connected to a sensor on the surface.
45. According to the context, what does the word "positives" in the fifth paragraph mean?
A Positive electric charges.
B Evidences.
C Warnings.
D Predictions.
第5部分：补全短文(第46～50题，每题2分，共10分)
阅读下面的短文，文章中有5处空白，文章后面有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。请将答案涂在答题卡相应的位置上。
Forms of Environmental Disease
46 . How the diseases are expressed depends on how the particular environmental agent enters the body, how it is metabolized(引起代谢)，and by what route it is excreted. The skin, lungs, liver, kidneys, and 47 . Of particular concern is the capacity of many environmental agents to cause various cancers, birth defects or spontaneous affection (through fetal exposure), and mutations(突变)in germ cells, 48 .
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