In this section, you will hear 3 short passages. At the end of each
passage, you will hear some questions. Both the passage and the questions will
be spoken only once. After you hear a question, you must choose the best answer
from the four choices marked A, B, C and D.
Passage One Questions 26 to 28 are based on the passage you have just heard.
A．Because they need more protein than vegetables supply. B．Because they cannot digest vegetables. C．Because they use more energy than adults. D．Because they cannot easily digest milk and milk products.