16
(A)examples
(B)origins
(C)impacts
(D)species

12 Although Elaine gave me very _____ directions to her house, I still got lost. (A)inexplicable (B)dispensable (C) explicit (D)exchangeable

13 Search engines are good at matching words across websites but have struggled with nuance to answer questions in everyday language. (A)Matching words across websites makes it difficult for search engines to provide detailed answers. (B)Subtle differences among daily usage make it difficult for search engines to provide answers to users. (C)Although search engines can find answers, users may not know how to match the exact wording across websites. (D)Although worldwide users function in many languages, search engines can provide answers accurately in only one language.

14 (A)Nevertheless(B) No doubt (C) In contrast (D) What's worse

15 (A)in the beginning (B) once upon a time (C) at once(D) over time

17 (A)incompatible with known as (B) popular with (C) dictated (D) by

18 (A)One (B) Each (C)The other (D) That

19 (A)People created signals for communication (B)People were limited in many ways (C)People used birds to send messages (D)People live in their horse carriages

20 (A)They sent messages in simple ways They knew a lot about geography (B) (C)For example, they lacked printed materials (D)Mountains and rivers are geographical features

21 (A)Business caused changes (B)Life became convenient (C)Travelling caused casualties (D)Relations became closer

22 (A)As a matter of fact, it is the best way to sell and buy things (B)It is, however, the easiest way to communicate with friends (C)Suddenly communication and knowledge improved greatly (D)Fortunately, many people were happy to help