[单项选择]National Parks have more and more visitors each year. In the last ten years the number of campers using the camp sites has more than doubled. Camping as a family vacation has suddenly become extremely popular in America. It is a cheap way to travel; its simple pleasures are a pleasant change from hectic urban life; and it can be enjoyed by children of all ages.
In car trunks or in racks on top of cars, families load a tent, sleeping bags, inflatable mattresses, cooking pans and eating utensils, and an ice chest for storing food. When they arrive at a camping ground they find a cleared space in which to pitch their tent, a fireplace for cooking, and usually a picnic table and benches--water and firewood nearby. By evening they are settled under the stars, the campsite around them dotted with lights from cooking fires and lanterns hung from trees.
Vacations are not all in resorts or in the wilderness. Swarms of vacationing Americans visit New York and Washington each year. They
A. Vacations in America.
B. Big Cities in America.
C. American Family Life.
D. Camping as a Family Vacation.

[单项选择]National Parks have more and more visitors each year. In the last ten years the number of campers using the camp sites has more than doubled. Camping as a family vacation has suddenly become extremely popular in America. It is a cheap way to travel; its simple pleasures are a pleasant change from hectic urban life; and it can be enjoyed by children of all ages.
In car trunks or in racks on top of cars, families load a tent, sleeping bags, inflatable mattresses, cooking pans and eating utensils, and an ice chest for storing food. When they arrive at a camping ground they find a cleared space in which to pitch their tent, a fireplace for cooking, and usually a picnic table and benches--water and firewood nearby. By evening they are settled under the stars, the campsite around them dotted with lights from cooking fires and lanterns hung from trees.
Vacations are not all in resorts or in the wilderness. Swarms of vacationing Americans visit New York and Washington each year. They
A. National Parks provide camp sites.
B. Camping is a cheap way to travel.
C. Camping makes city people have a change.
D. People of all ages enjoy campin

[填空题]Visitors’ injury in United States national parks was the result of humans surprising these nervous, shy, and easily frightened animals.

[填空题]More media advertising options have more impact on the creative challenge.

[判断题]Dr. Wilson and Mr. Wang have known each other before.

[单项选择]Some countries are more populous; some have more crime. But in no other country are crime fighters quite so knowledgeable about citizens as in Britain. On January 4th a boastful Home Office detailed the triumphs of the world’s biggest forensic DNA database, which holds samples from more than 5% of the entire population of England and Wales. Recent changes to the rules governing the database mean that it may eventually hold profiles from more than a fifth of all adults.
Once a country starts storing DNA samples from criminals it is hard to resist the urge to expand the collection. When the National DNA Database (NDNAD) was set up, in 1995, samples could only be taken from those charged with "recordable" offences. If a suspect was not tried, or was freed, the sample had to be destroyed and the profile removed from the database.
That law was abandoned in 2001, after two men who had been convicted of murder and rape had their cases overturned on appeal--the DNA evidence against t
A. B．British citizens are quite knowledgeable about DN

[判断题]Women have more fat cells so women have less water.