题目内容：

To help the environment, many Americans have made the change from paper and plastic(塑料的) 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 may not move onto food. But over time, paint on the bags can break off and the bags can wear out. When this happens, lead can be freed.

The bags with the highest levels of lead had beautiful designs and many pictures. Plain（朴实无华的） 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.

1.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.

2.Lead in shopping bags will probably come out when ________.

A. the paint is separated from them    B. they are thrown away

C. food is put in them    D. they are put with other rubbish

3.What's the best title for the text?

A. The return of paper bags

B. Time to invent greener shopping bags

C. The harm of lead

D. Be careful with reusable shopping bags