Scientists from China found amazing footprints in Huaiji county, Zhaoqing city, Guangdong province. The footprints are from two kinds of ancient animals — small mammal-like animals and dinosaurs. For the first time ever, they discovered these kinds of footprints together in Cretaceous strata (白垩纪地层) at this site.
One kind of footprint is tiny, just 1.8 centimeters long! The track belongs to a small mammal-like animal, maybe the size of a mouse. Professor Xing Lida, who led the study, said the tiny tracks show the animal had four short toes. He thinks it walked near a lake or river. The other footprints are much bigger dinosaur tracks. These footprints belong to theropod dinosaurs. They show three toes with clear claw (爪) marks. Scientists also found two larger footprints (each 45 cm long). The animals that made these larger footprints walked on all fours.
This discovery helps us understand what animals lived together long ago. “It teaches us about life millions of years ago,” said Professor Xing. “Finding more tracks will help us learn even more.”
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1.1. Where were the footprints found?
A In Beijing.
B In Guangdong.
C In Shanghai.
D In Hainan.
解析：选B。B细节理解题。根据文章首句“Scientists from China found amazing footprints in Huaiji county, Zhaoqing city, Guangdong province.”可知，足迹发现于广东省。故选B。
2.2. How long is the tiny footprint?
A 1.8 cm.
B 45 cm.
C 10 cm.
D 5 cm.
解析：选A。A细节理解题。第二段首句指出“One kind of footprint is tiny, just 1.8 centimeters long!”可知，新发现的哺乳形类足迹长度仅为1.8厘米。故选A。
3.3. Where did the small animal probably live?
A In the desert.
B On a mountain.
C Near a lake.
D In the sky.
解析：选C。C细节理解题。根据“Professor Xing Lida...said the tiny tracks show the animal had four short toes. He thinks it walked near a lake or river.”可知，这只小动物可能生活在湖边。故选C。
4.4. Why is this discovery important?
A It proves dinosaurs wore shoes.
B It shows mice lived with humans.
C It made Professor Xing famous.
D It helps learn about ancient life.
解析：选D。D 推理判断题。最后一段明确说明该发现帮助了解远古生物（helps us understand what animals lived together long ago），且教授说teaches us about life millions of years ago。故选D。
