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  3. The Indian coastal belt has not recorded many Tsunamis in the past. Waves companying earthquake activity have been reported over

The Indian coastal belt has not recorded many Tsunamis in the past. Waves companying earthquake activity have been reported over

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问题     The Indian coastal belt has not recorded many Tsunamis in the past.
Waves companying earthquake activity have been reported over the North 【M1】______
Bay of Bengal. During an earthquake in 1881 which has its epicenter near 【M2】______
the centre of the Bay of Bengal, Tsunamis were reported. The earthquake of
1941 in Bay of Bengal caused some damage in Andaman region. This was
unusual because most Tsunamis were generated by shocks which occur at 【M3】______
or near the flanks of continental slopes. During the earthquake of 1819 and 【M4】______
1845 near the Rann of Kutch, there were rapid movements of water into sea. 【M5】______
    There is no mention of waves resulting in these earthquakes along the 【M6】______
coast adjacent the Arabian sea, and it is unlikely that Tsunamis were gener- 【M7】______
ated. Further west, in the Persian Gulf, the 1945 Mekran earthquake gener
ated Tsunami of 12 to 15 metres height. This caused a huge deluge, with
considerate loss of life and property at Ormara and Pasi. The estimated 【M8】______
height of Tsunami at Gulf of Combay was 15m and no report of damage is 【M9】______
available. The estimated height of waves was about 2 metres at Mumbai,
which boats were taken away from their moorings and casualties occurred. 【M10】______
【M9】
选项
答案and — but
解析 前文说12米到15米高的海啸给Ormara和Pasi两个地方带来了很大的损失，而Combay海湾的海啸有15米，却没有灾难记录。从前后句的逻辑关系来看，二者是对比转折，所以应该用but。
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