题目内容：

Read the passage carefully and answer the questions according what you’ve read.

In most towns today, you can see teenagers standing over electronic machines with flashing lights, shooting at spaceships from other planets and dropping bombs on strange monsters. The machines have names like Space Warrior, Dark Invader and so on. It used to be believed that damage was done only to those strange visitors from outer space, but now it seems that they are striking back.

   Many teenagers like electronic games so much that they can't stop playing. They spend hours tightly holding the joystick controls and constantly pressing buttons marked” fire”. They develop pains on their fingers because of the constant pressure. They play and play so that the pains have no chance to cure properly. The rapid wrist movement required to guide the spaceship across the screen causes another problem: The muscles of the wrist and arm become so inflamed (发炎的)and swollen that they press against the bones. This condition is what doctors now call "Space Warrior's Wrist". Other strange aches and pains also are likely to affect the elbows and shoulders.

   Another even more alarming problem is shown by the case of a 17-year-old girl which was recently in the British Medical Journal. She had been playing various kinds of electronic games for more than two hours a day. Her father repaired games and machines and she could use the cassettes and systems in his workshop as often as she liked. One day, after playing a game called Dark Invader, she lost consciousness (晕倒) and fell to the floor.

   Doctors who examined her found she was suffering from an unusual illness caused by lights flashing at a particular frequency.

1.What are the teenagers crazy about today in most towns? (Within 5 words)

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2.What will happen to the teenagers if they spend too much time playing electronic games? (Two points within 15 words)

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3.How long did the 17-year-old girl play different kinds of electronic games? (Within 10 words)

   _________________________________________________________________________.

4.What was the cause of the girl’s unusual illness? (Within 10 words)

   _________________________________________________________________________.

5.What does the passage mainly talk about? (Within 10 words)

  __________________________________________________________________________.