Section D
1. They are the oldest type of tigers living in the world.
living in the world（正生活在世界上的）现在分词短语可放所修饰的名词后，相当于一个定语从句 (that are) living in the world.
2. They are in danger now.
be + in +名词，用来表示“处于…之中”如：be in danger, be in trouble, be in health.
3. The plants in Picture One are more beautiful than those in Picture Two.
those 在此指代“the plants”。包含比较级的句子必须是同类事物才能比较，为了避免重复，用that（代单数名词）或 those (代复数名词) 代替前面出现的词或短语:
The climate of Kunming is better than Beijing. (改错,天气不能和北京比)→ The climate of Kunming is better than that of Beijing. (that= the climate)
4. 题：
Suzhou is ( ) most beautiful tourist city and I believe I’ll come for( ) second time.
A. the, a B. a; a C. the; the D. a; the
解析：形容词的最高级前面要加the, 序数词前一般也加the, 表“第几”，如：the first lesson.
但序数词前也可用a, 表“再第几次”.
如：He had tried for six times, but he failed, then he tried a seventh time. (他再试了第七次)， 故答案为：A
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