A high school history teacher once told us, “If you make one close friend in school, you will be most fortunate. A true friend is someone who stays with you for life."1 teaches that he was right. Good friendship is just not easily 2

        It is possible that we simply do not stay in one place long enough food 3friendship to4. However, there can be5disagreement on the need for each of us to think carefully about the kind of friendship we want.

        To most of us, friendships are considered very important, but we need to have clear in our 6 the kinds of friendship we want. Are they to be close or7at arm's length? Do we want to 8ourselves or do we want to walk on the surface? For some people, many friendships on the surface are 9enough—and that' s all right. But at some point we need to10that our expectations are the same as our friends' expectations. The sharing of11experience 12our tears as well as our dark dreams is the surest way to deepen friendships. But it 13be undertaken(进行) slowly and carried on only if there are 14of interest and action in return.

          What are some of the 15of friendship? The greatest is the attraction to expect too much too soon. Deep relationships 16time. Another“major difficulty" is the selfishness to think one “possesses" the other, including his time and attention. Similarly, friendships 17actions in return. In 18words, you must give as much as you take. Finally there is a question of taking care of. Unless you spend 19time together, talking on the phone, writing letters, doing things together, friendships will die20.

选出单词中不属于同一类的一项。

    Captain（船长）Nemo invited me and my friends to go hunting with him in the forests of Crespo Island. I asked him why he was so interested in Crespo Island. “I thought you preferred the sea to being on land.”

    “I do,” replied the captain. “But these forests are under the sea.”

After going through a door, we were about ten meters under the water. The light from the sun reached us. Everything looked very colourful. We were going deeper and deeper. At 100 meters deep, we could see quite well, and Captain Nemo stopped and pointed to some dark shapes. This was the forest. The “trees” in the forest were giant seaweed, and all their “branches” were vertical（垂直的）.We could not stop looking at them. Fish swam around the branches like birds in a forest.

    Suddenly, I saw a large sea spider about a meter tall. It was going to attack me. Captain Nemo's man killed it with his gun, but it reminded me that the sea could be as dangerous as it was beautiful. When we reached 150 meters, it was dark. The sun's light could not reach this depth（深度）. We turned our lights. We could see about 20 meters around us. Finally, we found Crespo Island—where a steep rock wall rose in front of us.

    We could go no further, so we walked back toward the Nautilus. Suddenly, Captain Nemo stopped and shot an animal with his gun, it was a beautiful and rare sea otter. At last, we could see the Nautilus. Several large sharks swam over us. Luckily they didn't see us. We re-entered the Nautilus safely. I was tired but amazed by what I had seen.

下列事例中，能避免惯性产生的危害的是   （   ）