John likes chocolates(巧克力) very much, but his mother doesn't give him. They're bad for his teeth(牙齿), she thinks. But John has a very nice grandfather. The old man loves his grandson very much and sometimes he buys John some chocolates. Then his mother lets him eat them, because she wants to make the old man happy.

    On Sunday evening, it is John's seventh birthday. He says,” Please, God, make them give me a big box of chocolates for my birthday.” His mother says,” God can't hear you. Don't shout(喊叫).” “I know,” says the clever boy with a smile. “But grandfather is in the next room, and he can.”

    My friend, Victor, is a zoo keeper in the National Zoo. His work is very interesting but it is hard. Sometimes it is dangerous, too. Every morning the zoo keepers have to get up at five to prepare the food for the animals. Each kind of animal is given special food. For example, the lions must be given meat; the deer must be given grass and leaves; and the parrots must be given fruit and nuts. Sometimes some animals won't let the others eat their food. If this happens,  each of them must be fed separately (分离地).

    Every morning each cage must be washed by the zoo keepers. This can be dangerous, especially with lions and tigers. To make the work easier, the animals are locked in the sleeping compartments (隔间) while the cages are being washed. When the animals are sick, the zoo keepers must look after them. Each sick animal is kept in a separate cage and given medicine. Sometimes they must be given injections. It is not easy to inject a sick lion!

    All the keepers live near the zoo. Each of them has a small house. There he lives with his family. They do not have holidays on Sundays and public holidays. Instead, each of them has a day off during the week. Each keeper has a holiday on a different day from that of the other keepers.

    The most important job of the keepers is to look after the safety of the visitors. People must be prevented from doing dangerous things. Many people have been injured because they did careless things, like putting their hands into the lion's cage.

根据以上短文内容，然后从每题所给的四个选项中选择最佳选项。

My name is Mary. I'm a teacher. It's 9 o'clock on Monday. My class begins. There is a boy in my class. His name is Bob. I ask Bob, "I get some apples from a fruit seller*. And I give you one apple and one apple and one apple. How many apples have you got?"

After some time, Bob says, "Four. "

I say, "Please listen to me carefully. It's not difficult. I give you one apple and one apple and one apple. How many apples have you got?"

"Four, " Bob says. 

I remember Bob likes carrots. Then I say, "I give you one carrot and one carrot and then one carrot. How many carrots have you got?"

"Three?"

"Yes!" I ask, "I give you one apple and one apple and one apple. How many apples have you got?"

"Four. "

"How? Please tell me. How?" I ask. 

"Because I already have an apple in my bag, " says Bob. 

Now I think Bob gives the right answer all the time. 

Many families take their children for trips on holiday. They usually travel for days 1 weeks. But Julie and Tim Rivenbark had a longer holiday with 2 two children. The Rivenbark family had a one-year trip around the world. They 3 about 30 countries in all. 

Ms Rivenbark said they just wanted 4 as much of the world as they could. The family spent time floating (漂流) on a boat in Italy. They flew in hot-air balloons (气球) in Myanmar. They had 5 long walk to the Everest Base Camp in Nepal and also went on safari (去游猎) in South Africa. 6 fantastic trip!

Tyler, the son, said he enjoyed 7 about the people they met. And his sister, Kara, found that she liked Chinese food 8 . 

Ms Rivenbark said the trip taught the children more than short visits would 9 . 

"I think the long travel can teach them how they see the world. I'm sure they can learn so much 10 the travel. "