Singapore Flyer is the second highest observagtion flyer in the world, only next to London Eye in London.

Choose the right explanation of the word "observance" in the last paragraph. 查看材料

A.Remark made by people.

B.Action in accordance with custom.

C.Performance of certain tradition.

D.Notice paid widely.

听力原文： April Fool's Day is traditionally a day to play practical jokes on others, send people on fool's errands, and fool the unsuspecting. No one knows how this holiday began but it was thought to have originated in France. April Fool's Day is a "for-fun-only" observance. Nobody is expected to buy gifts or to take their "significant other" out to eat in a fancy restaurant. Nobody gets off work or school. It's simply a fun little holiday, but a holiday on which one must remain forever vigilant, for he may be the next April Fool!

Each country celebrates April Fool's differently. In France, the April Fool's is called "April Fish" (Poisson d'Avril). The French fool their friends by taping a paper fish to their friends' backs and when some discover this trick, they yell "Poisson d'Avril!".

In England, tricks can be played only in the morning. If a trick is played on you, you are a "noodle". In Scotland, April Fool's Day is 48 hours long and you are called an "April Gowk", which is another name for a cuckoo bird. The second day in Scotland's April Fool's is called Tally Day and is dedicated to pranks involving the buttocks. Tally Day's gift to posterior posterity is the still-hilarious "Kick Me" sign.

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A．In America.

B．In England.

C．In France.

D．In Spain.

The word "obscurities" in the second paragraph most probably means

A．misunderstanding.

B．small potatoes.

C．well-known people.

D．uneleamess.

The word "obscurities" in the second paragraph most probably means

A．misunderstanding,

B．small potatoes.

C．well-known people,

D．unclearness.

According to the passage, an important limitation of relativity theory is that

A．it fails to describe space on a non-local level, complicating attempts to determine the geometrical model of the universe

B．it cannot account for the possibility that the universe may be multiply- connected instead of singly-connected

C．it yields inconsistencies in spatial topology equations, discriminating unnecessarily between the torus and the plane

D．it creates the illusion that observable space is curved, when in fact the universe may be Euclidean and planar

E．it does not provides sufficient variety in geometrical models to describe all the possible ways in which space may curve