For more than six million American children, coming home after school means coming home to an empty house. Some deal with the situation by watching TV. Some may hide. But all of them have something in common. They spend part of each day alone. They’re called latchkey children. They’re children who look after themselves while their parents work and their bad condition has become a subject of concern（关心）。
Lynette Long was once the principal（校长）of an elementary school. Said, “We had a school rule against wearing jewelry. A lot of the kids had chains around their necks with keys attached（附带）。 I was often telling them to put them inside their shirts. There were so many keys that it never came to my mind what they meant.” Slowly, she learned they were house keys.
She and her husband began talking to the children who had them. They learned of the effect working couples and single parents had on their children Fear is the biggest problem faced by children at home alone. One in each three latchkey children the Longs talked to reported being scared（害怕）.Many had nightmares and were worried about their own safety.
The most common way latchkey children deal with their fears is by hiding. It might be in a shower stall, under a bed, in a closet. The second is TV. They’ll often play it high volume.
It’s hard to get statistics（统计数字）on latchkey children, the Longs learned. Most parents are slow to admit they leave their children alone.
1. The main idea about “latchkey” children is that they ______.
are growing in numbers
are also found in middle-class neighborhoods  
watch too much TV during the day
suffer problems from being left alone
2. Which sentence in the second paragraph is the topic sentence?
We had a school rule against wearing jewelry.
A lot of kids had chains around their necks.
I was often telling them to put them inside their shirts.
She learned they were house keys.
3. The main feeling these children have when they are at home by themselves is ______.
A. tiredness     B. freedom     C. loneliness     D. fear
4. The word “nightmare” in the third paragraph probably means______.
A. night suit                                 B. night habit
C. terrible dream at night         D. staying up at night
5. We may draw a conclusion that_______.
latchkey children enjoy having such a large amount of time alone
latchkey children try to hide their feeling
latchkey children often watch TV with their parents
it’s difficult to find out how many latchkey children there are