I.1-5 BAACB
II. 1. habit 2. century 3. instead 4. tired 5.fresh 6. fruit
III. 1. really 2. staying 3. sports 4. listening 5. Healthy
IV. 1. build us up 2. insteadof 3. gets tired easily 4. Healthy eating habits5. doing exercise
V. 1-5 BCCAA
软件 作业互助组 上应该有
互动作业只有2015没有2016的