[判断题]Instead of importing Chinese labor，the United States is importing goods that are produced with Chinese labor，which is a typical example of importing goods from another country instead of importing factors of production．( )

[单项选择]A mandatory traceability system in the United States would help improve the safety of food, such as produce, a health official told lawmakers on Wednesday, and three weeks after the government declared an end to the worst foodborne outbreak in a decade. In the past, some produce firms, including many in the tomato industry, use voluntary traceability programs but their approaches vary.
Lawmakers said a mandatory program was overdue, and would help U.S. regulators improve safety and restore consumer confidence in food following a series of foodborne outbreaks since 2006.
"It is the system that is broken," said Rep. Rosa DeLauro, chair of the House Appropriations subcommittee on agriculture. "You still do not have mandatory traceability, mandatory performance standards. You are looking for a needle in a haystack." Regulators struggled to pinpoint the source of an outbreak of Salmonella St. Paul earlier this year that sickened more than 1,400 people and put 286 in the hos
A. compulsory
B. voluntary
C. recommendable
D. improved

[单项选择] To make your driving experience in the United States safe and enjoyable, our company is providing you with this "Rules of the Road" pamphlet. Please note, however, that this pamphlet does not represent a complete list of the motor vehicle and traffic laws of the various states. Regardless of whether or not a specific law is outlined below, it is your responsibility as the driver to follow all applicable (适合的) motor vehicle and traffic laws. Do Not Drink and Drive! Each state strictly prohibits Driving While Drunk. Wear Seatbelts—It’s the Law! Also, the use of child seats for babies and small children (usually under age 5) is required to stay in all states. Place child seats in the back seat only. Stay to the Right In the United States, motor vehicles are operated on the right hand side of the road. Be extremely careful to stay to the right at all times--especially if you are from a left-hand drive country. Obey the Speed Limit In most states, the maxi
A. provide a full list of traffic laws and regulations in the US
B. help drivers to enjoy safe and pleasant driving in the US
C. tell drivers to avoid dangerous roads in various states
D. show drivers the different road signs in all the states

[单项选择]The largest and smallest states of the United States are（）
A. Alaska and Rhode Island
B. Texas and Maine
C. Texas and Rhode Island
D. Alaska and Maine