单项选择题


Directions: In this part you will read a selection of texts, such as magazine and newspaper articles, letters, and advertisements. Each text is followed by several questions. Select the best answer for each question and mark the letter (A), (B), (C), or (D) on your answer sheet.
Questions 153-155 refer to the following chart.
CROWDING THE PLANET
This chart shows how much the world’s population grew between 1900 and 2000, and how much experts believe it will grow by 2025. The numbers are in billions.
When was the population under 2 billion

A. In 1.900
B. In 1925
C. In 1950
D. In 1975