What is crucial in the development of ‘babies’ brains?
A、Babies’ ability to focus.
B、Babies’ mastery of skills.
C、Babies’ muscle strength
D、Babies’ near-constant movement.
What should we do to better understand cats , according to the last paragraph?
A、To treat them as friends.
B、To compare them with dogs.
C、To regard them as animals.
D、To care about their behavior.
2. In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation.