In this section, you will hear a monologue. The monologue will be read
twice. After the monologue, there will be a one-minute pause. During the pause,
read the questions and the four choices marked A, B, C and D, and decide which
is the best answer. Then mark the corresponding letter on the answer sheet with
a single line through the centre. Questions 16 to 20 are based on the
passage you’ve just heard.
What evolutionary change in birds led to a nest’s building
A. Their flying ability improved greatly.
B. They became warm-blooded.
C. They began to lay eggs.
D. They live in cold places.