【单选题】

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When my wife, who is a Spanish spent her first winter in London a few years ago, she used to ask me time and again, "Where’s the fog "Almost all foreigners (26) to find the city wreathed in yellow-gray mist for most of the year.Dickens, who was. (27) responsible for painting this (28) in people’s minds, certainly wasn’t exaggerating in those days, People (29) in the nineteenth century that when someone. (30) suicide by jumping into the Thames he has chocked by the fog and poisoned by the terrible (31) of the river before he had time to drown himself. In fact, the situation (32) in recent years. When I was a boy in London city 30 years ago I was often unable to see (33) of the road when I left home on winter mornings.
The decisive steps that have turned London into one of the (34) cities in the world (35) taken at the end of the 1950s.But Londoners still (36) that fog (37) returns. The change took place as a result of two main improvements. Factories are compelled to install clean equipment (38) close down, and private householders were not allowed to (39) coal unless it was smoke-free.But the (40) ecological miracle in London occurred (41) 1964 onwards when the Thames WaterAuthority began to pump vast (42) of dissolved oxygen into the river. (43) , all the species of fish that had gradually disappeared from the Thames (44) 1, 800 have returneD、Some are even caught by fishermen (45) the House of Parliament.
In the 3rd paragraph, the "Guess Who" card is probably used to______.
A、be a gift for relatives on Valentine’sDay
B、make jokes
C、express happiness on Valentine’sDay
D、express love for a person one secretly admires