问题补充:
Thousands of years ago,humans didn’t live in towns.Sometimes they lived in caves (山洞) Thousands of years ago,humans didn’t live in towns.Sometimes they lived in caves (山洞) or built camps in the forest
答案:
1.A 2.B 3.C 4.D 5.C 6.A 7.B 8.D 9.B 10.C