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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】______
【M3】
选项
答案were — are
解析 虽然主句是过去时态，但是because从句中讲的是没有时间限制的一般道理，不因为时间的改变而改变，所以应该用现在时态。即使是在一个句子中，动词的时态也未必是一致的，要根据具体的时间所指而定。
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