교재오류 정정

p.20

시제 교체: 

1. were once connected에서 had once been connected로 변경

2. but had later drifted away에서 had 제거 

In the early 1900s, the German scientist Alfred Wegener hypothesized that all of the continents were once connected but had later drifted away from each other.

→ In the early 1900s, the German scientist Alfred Wegener hypothesized that all of the continents had once been connected but later drifted away from each other.

p.146

B번 지시문 중 Using your ideas from Questions A~를, Using your ideas from Question A로 변경