20xx新東方考研英語強(qiáng)化新題型7選5-文庫吧資料
2024-08-30 01:14本頁面
【正文】 kind of rock in which the remains are found tells us much about the nature of the original land, often of the plants that grew on it, and even of its climate. 42) ________. Nearly all of the fossils that we know were preserved in rocks formed by water action, and most of these are of animals that lived in or near water. Thus it follows that there must be many kinds of mammals, birds, and insects of which we know nothing. 43) ________ There were also crablike creatures, whose bodies were covered with a horny substance. The body segments each had two pairs of legs, one pair for walking on the sandy bottom, the other for swimming. The head was a kind of shield with a pair of pound eyes, often with thousands of lenses. They were usually an inch or two long but some were 2 feet. 44) ________. Of these, the ammonites are very interesting and
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