Pictures of animals were painted on the walls of caves in France and Spain because ______.

(单选题)On the double 11th day, my uncle’ s online store has success (单选题)—There is still a copy of the book “A Brief History of Time” (单选题)We can observe that artificial intelligence has made a(n) __ (单选题)It was not until mum agreed to take him to the zoo, ______wa (单选题)—Are you going to see “Hi, Mom” by Jia Ling?—______ It’s sai (单选题)The outbreak of Covid-19 has meant an ______ change in our l (单选题)Nowadays, cycling, along with jogging and swimming, ______ a (单选题)The underlined letters “ch” in the following words have the (单选题)It may be inferred from the passage that ______. (单选题)“Finally it gave” (Paragraph 5) means that ______.