Children learn primarily by physical experience direct the world around them.

单项选择题The pictures of the Loch Ness Monster show a remarkable resemblance to a plesiosaur, a large water reptile of the Mesozoic era presumingextinct for more than 70 million years.

单项选择题When an organism is completely encapsulated and preserved, it becomes a fossil, thereforeturning into evidence of things that once lived.