_______
A. It doesn't work as expected.
B. It can do harm to children.
C. It can find out serious injuries.
D. It can provide a detailed image of the brain.
_______
A. Many children suffered greatly from brain injuries.
B. Many children were threatened by lung cancer.
Children suffered more from brain injuries than from cancer.
D. Children had a high risk of developing cancer from the radiation.
_______
A. When a child aged two has no broken bones in the skull.
B. When a child aged ten lose consciousness.
C. When a child aged one has no serious headache.
D. When a child aged nine has normal mental activity.
_______
A. Listen to some rock music.
B. Get out of bed till being sleepy again.
C. Keep the lights on all night.
D. Read some interesting articles.
_______
Approaches to a better night's sleep.
B. The harm of lack of sleep.
C. Effects of modern technology on sleep.
D. Benefits of a good sleep.
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