Unit 16 1. Words to learn/1 2. Structure/5 3. Listening comprehension/5 4. Close reading/6 Unit 17 1. Words to learn/11 2. Structure/14 3. Listening comprehension/15 4. Close reading/16 Unit 18 1. Words to learn/21 2. Structure/25 3. Listening comprehension/26 4. Close reading/27 Unit 19 1. Words to learn/32 2. Structure/38 3. Listening comprehension/39 4. Close reading/40 Unit 20 1. Words to learn/45 2. Structure/51 3. Listening comprehension/52 4. Close reading/53 Unit 21 1. Words to learn/59 2. Structure/63 3. Listening comprehension/64 4. Close reading/65 Unit 22 1. Words to learn/71 2. Structure/75 3. Listening comprehension/75 4. Close reading/77 Unit 23 1. Words to learn/82 2. Structure/87 3. Listening comprehension/87 4. Close reading/89 Unit 24 1. Words to learn/94 2. Structure/99 3. Listening comprehension/100 4. Close reading/101 Unit 25 1. Words to learn/106 2. Structure/111 3. Listening comprehension/112 4. Close reading/113 Unit 26 1. Words to learn/118 2. Structure/120 3. Listening comprehension/120 4. Close reading/122 Unit 27 1. Words to learn/127 2. Structure/130 3. Listening comprehension/130 4. Close reading/132 Unit 28 1. Words to learn/137 2. Structure/138 3. Listening comprehension/139 4. Close reading/140 Unit 29 1. Words to learn/146 2. Structure/148 3. Listening comprehension/149 4. Close reading/150 Unit 30 1. Words to learn/156 2. Structure/158 3. Listening comprehension/158 4. Close reading/160 参考答案/166