题目内容：

Rescue officials in Poland are working quickly to clear one of the country’s highways. The roadway is covered with a sticky brown material. It is blocking cars from both directions.

What is causing the mess? Milk chocolate. The problems began early Wednesday, after a huge truck carrying many tons of liquid chocolate overturned. Chocolate spilled out. It spread across six driveways of Poland’s A2 highway.

The liquid chocolate solidified（凝固）as it cooled, causing even more difficulties. The accident happened near the western Polish town of Slupca. Bogdan Kowalski is with the fire fighters of Slupca. He told the Associated Press that “the cooling chocolate is worse than snow”.

Videos published on social media showed rescuers and cleaners were trying to move the sticky brown mess with a bulldozer（推土机）.

The private Polish broadcaster TVN24 reported that the driver of the truck was taken to a hospital with a broken arm. The accident happened in the morning when there was little traffic. Nobody else was harmed.

The sticky situation became a hot topic on social media. Some people offered to help the clean-up workers by eating the chocolate themselves.

Marlene Kukawa is a media officer for Slupea police. She told the New York Times that rescue workers needed to remove the truck from the highway first. “The cleanup”, she said at the time, “will take a few hours or more.” She added that accidents are rare in this part of the A2 highway. And, she told the New York Times, she is sure the area has never experienced something quite like a huge chocolate spill.

1.What caused the traffic trouble?

A. A broken-down car.    B. Cars stuck on the highway.

C. Serious traffic accidents.    D. The liquid chocolate.

2.What made the situation even worse?

A. The difficulty to get rid of the chocolate.    B. Fear caused by videos on social media.

C. The chocolate becoming hard.    D. Snow falling on the highway.

3.Why did some people offer to eat the chocolate?

A. To avoid wasting the chocolate.    B. To reduce loss for the driver.

C. To play a joke.    D. To solve the problem.

4.What did Marlene Kukawa think of the incident?

A. It happened very rarely.    B. It was the most serious accident.

C. It was unexpected by other drivers.    D. It was lucky that no one was killed.