单选题
For more than six million American children, coming home after school means coming home to an empty house. They spend part of each day alone. They are called "latchkey children". They're children who look after themselves while their parents work. And their bad conditions have become a social problem. Lyne Brown was once the headmaster of an elementary school. She said, "A lot of kids had chains around their necks with keys attached.! was constantly telling them to put them inside shirts. There were so many keys, it never came to my mind what they meant. ",slowly, she learned they were house keys. Lyne learned of the impact working couples and single parents were having on their children. She found that Fear is the biggest problem faced by children at home alone. 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 at high volume. It's hard to get statistics (情况，材料) on latchkey children. Most parents are slow to admit they leave their children alone.
单选题
The main idea about "latchkey children" is that they______.
【正确答案】
D
【答案解析】根据文章第1段第5句They spend part of each day alone及全文内容可推知钥匙儿童指经常独自在家的孩子。
单选题
Which sentence in the second paragraph is the topic sentence?
【正确答案】
D
【答案解析】因为全文讲述的都是一些有关“钥匙儿童”的情况，再根据文章第2段最后一句Slowly，she learned they were house keys可知孩子们脖子上戴的是串钥匙，推知此题D。
单选题
The main feeling these children have when they are at home by themselves is______.
【正确答案】
B
【答案解析】文章第3段第3句Fear is the biggest problem faced by children at home alone可知钥匙儿童的最大问题是恐惧。
单选题
We may draw a conclusion that______.
【正确答案】
D
【答案解析】文章最后一段倒数第2句It's hard to get statistics on latchkey children，the Browns learned可推知由于父母不愿意透露孩子在家的情况，因此很难统计出钥匙儿童的实际数量。
单选题
Which of the following statements is NOT true?