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（Insert Text Question）
This is a question that has puzzled scientists for ages.
Where would the sentence best fit?
Extinct but already fully marine cetaceans are known from the fossil record. ■（A）How was the gap between a walking mammal and a swimming whale bridged? ■（B）This is a question that has puzzled scientists for ages. Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans. ■(C)Very exciting discoveries have finally allowed scientists to reconstruct the most likely origins of cetaceans.■（D）In 1979, a team looking for fossils in northern Pakistan found what proved to be the oldest fossil whale.（Paragraph 1）
本题解析：
插入句中“this is a question”可以推出该句之前应恰好提出了问题，而B处之前“How was the gap between a walking mammal and a swimming whale bridged? ”正与插入句相呼应，因此选择B。
正确答案：
B
13-14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some answer choices do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.
（Prose Summary Question）
This passage discusses fossils that help to explain the likely origins of cetaceanswhales, porpoises, and dolphins.
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Answer Choices
1. Recent discoveries of fossils have helped to show the link between land mammals and cetaceans.
2. The discovery of Ambulocetus natans provided evidence for a whale that lived both on land and at sea.
3. The skeleton of Basilosaurus was found in what had been the Tethys Sea, an area rich in fossil evidence.
4. Pakicetus is the oldest fossil whale yet to be found.
5. Fossils thought to be transitional forms between walking mammals and swimming whales were found.
6. Ambulocetus" hind legs were used for propulsion in the water.
本题解析：
正确答案应陈述文章