时长:90分钟 总分:100分
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What does “such natural disasters” in the first paragraph refer to?
Which of the following statements is true of landslides?
Why do researchers develop a new device to monitor signs of landsides?
Which of the following statements is NOT true of the device,according to Paragraph 4?
According to the context,what does the word “positives” in the fifth paragraph mean?
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