阅读理解。阅读下列短文, 从给的四个选项 (A、B、C和D) 中, 选出最佳选项。
Imagine looking for your lost dog. You step into a cave. But instead of the dog, you find beautiful cave paintings. You see paintings of horses, deer, and bison drawn in black, brown, red and yellow. Your first question would probably be“Who did this? ”
