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28.First reported by Spanish explorers in 1796, the asphalt in California’s La Brea Tar Pit was mined commercial for many years.
这题选C,
25.With little nor no mass and no electric charge, neutrinos can penetrate a solid object such as the Earth as if it were not there。
这题选A,我刚刚看到A时候也觉得很奇怪,但是看到D后觉得were错了,因为were前面是it啊,所以were因该改成was啊??
24.Many dinosaurs were so much heavy that they spent most of their lives in swamps and shallow lakes where water could support them.
这个选A,难道不是so....that结构吗?
PLASE..........帮帮我!
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