短文改错

     Yesterday a school boy is daydreaming in class.Not knowing that he was doing, he put a

pen cap into his mouth.A few minutes late, he was terrified to find that he had swallowed it!

The teacher was shocking when the boy stood up and said, "I've just swallowed a pen cap.

"He was quickly sent the nearest hospital.There a doctor examined his and said the best

treatment was to take some medicines so that the pen cap could pass natural.Three hours later

the boy successfully made it."She is really lucky, " said the doctor."It's not rare that small children

put things into their mouths for a fun.It's very danger."

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Questions from 31 to 35 are based on the following passage: Against this background, the WTO faces several daunting challenges. The first is to continue bringing down tariffs on traded goods. Average penalties have fallen steadily since the GATT’s formation but even the most open economies retain lofty barriers: for instance, America still charges a tariff of 14.6% on import of clothing, five times higher than its average levy.Resistance to tariff cuts is pest in agriculture. According to Tim Josling, a trade expert at Stanford University, tariffs and other barriers on farm goods average a crippling 40% worldwide and create distortions that “destroy huge amounts of value”. A new set of global farm talks is planned to start in 1999. At the least, you might think, these could lock in impressive reforms in Latin America and encourage further watering-down of the European Union’s Common Agricultural Policy. But they will prove difficult: squabbles over agriculture almost sank the Uruguay round.

What does the WTO face（）

A．fair trade rules

B．free trade

C．export tax reduction

D．several challenges