B．If you want to visit the scroll painting, you can book tickets by phone.

　　C．The scroll painting is very popular all the time and many people visit it.

　　D．So far the Palace Museum has been open to the public for 100 years.

　　解析：选C　推理判断题。根据第四段中的"Faced with its huge popularity"以及第五段中的"waiting in line for hours has become routine"可知，选C项。

　　B

　　To help the environment, many Americans have made the change from paper and plastic bags to reusable shopping bags. But a report by a Florida newspaper says that reusable shopping bags sold by some supermarkets have high levels of lead (铅), which can be dangerous to humans, especially young children. Now, there's a call for a rethink about the use of reusable shopping bags.

　　"When our families go to the store looking for safe and healthy foods, the last thing they should be worrying about is a bag，" Charles Schumer, a government official said."Quick and complete research will allow everyone to make right decisions."

　　The newspaper bought more than a dozen bags sold at Publix supermarkets from Florida supermarkets to test them for lead. The results showed that certain bags had lead levels that worried health officials. Some bags had enough lead in them to be considered dangerous waste if people were to throw the bags out with other rubbish. Lead in the bags is not likely to move onto food. But over time, paint (油漆) on the bags can break off and the bags can wear out. When this happens, lead can be freed.

　　The affected (受影响的) bags were found in Florida. But Publix has more than 1,000 stores across America. Publix says that its bags don't break any laws about lead levels, but that they have asked the makers of the bags to reduce (降低) the lead levels in them.

　　The bags with the highest levels of lead had beautiful designs and many pictures. Plain reusable bags without them are found to have little lead. People worried about lead levels in reusable bags can turn to cloth. Paper bags are also a good choice, since paper can be reused.

语篇解读：本文是说明文。环保购物袋中铅的含量让人们对其安全性产生了担忧。

　　5．What worries people now is that reusable shopping bags ________.

　　A．can't be reused

　　B．can be a danger to people

　　C．are a waste of money

　　D．are as bad as paper bags

解析：选B　细节理解题。根据第一段的"reusable shopping bags sold by some