It was a very foggy day in London. The fog was so thick that it was impossible to see morethan a foot or so. Buses, cars and taxis were not able to run and were standing by the side of theroad. People were trying to find their way about on foot but were losing their way in the fog. Mr. Smith had a very important meeting at the House of Commons and had to get there but no onecould take him. He tried to walk there but found he was quite lost. Suddenly he bumped into astranger. The stranger asked if he could help him. Mr. Smith said he wanted to get to the Housesof Parliament. The stranger told him he would take him there. Mr. Smith thanked him and theystarted to walk there. The fog was getting thicker every minute but the stranger had no difficultyin finding the way. He went along one street, turned down another, crossed a square and at lastafter about half an hour's walk they arrived at the Houses of Parliament. Mr. Smith couldn'tunderstand how the stranger found his way. "It is wonderful," he said. "How do you find theway in the fog?"
"It is no trouble at all to me," said the stranger, "I am blind."
According to the passage, we can infer that " bumped into" means_______.

A．撞飞

B．偶然碰见

C．敲打

D．踩踏

Which of the following statements is NOT true?

A．The stranger has a better sight than Mr. Smith.

B．Heavy fog can cause traffic accidents.

C．It's easy to get lost on a foggy day.

D．The fog was getting thicker and thicker.

Why is it no trouble at all to the stranger to find the way in the fog?

A．Because he is a local inhabitant（当地居民） of London.

B．Because he lives next to the Houses of Parliament.

C．Because he is familiar with the route.

D．Because he finds the way not by sight but by heart.

This article mainly tells us that_______.

A．London is a foggy city

B．Mr. Smith works for the government

C．a blind stranger led the way for Mr. Smith on a foggy day

D．Mr. Smith had a very important meeting and lost his way in the fog