中国的养老方式是“反哺式”，而西方则是“接力式”。这说明 （  ）

阅读下列材料，从每题所给的A、B、C、D四个选项中选出最佳选项。

It's November. If you enjoy relaxing your mind, it's high time to go bird watching. In November, lots of visitors go to Poyang Lake of Jiangxi to relax in a special way. They watch birds. They watch white cranes(白鹤). With the coming of winter, all the birds begin to fly to some warmer places. In early November, a lot of white cranes fly across the sky of Poyang Lake.

    November is not the only time to do the fun thing. In fact, in Jiangxi you can watch birds all the year round. And you can do it wherever you go. Jiangxi is a good place for birds so it has a great many birds. If you keep your eyes open, you will probably find some around you. Here is some advice for bird watching:

● Don't get too close to birds that are building nests (巢) or feeding their babies. Some birds will give up their baby birds if they are frightened.

● Take a pair of binoculars (双筒望远镜) with you so that you can see the birds more clearly.

● Buy a good field (实地) guide if you don't have one yet. It can help you know the birds that you have never seen before.

先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。
   M____  friends is a skill like other skills. It improves with practice. If you want to meet people and make friends, you must be willing to take some a____ .
   You must first go where there are many people. You won’t make friends staying at home. Join a club or a party, talking with those who like the s____   things as you do. Or join someone in some a____.
   It’s human nature to feel a bit u____  about the unknown. Most of our fears come from doubts about o____ . Don’t forget they must be feeling the same way. Try to accept yourself as you are, and try to put the other person at ease（自由自在）. You’ll b____  feel comfortable.
   Try to act self-confidently t____  you don’t feel that way. When you enter a room    f____  of strangers, walk tall and straight, look directly at them and smile. Meeting someone new doesn’t mean that you will make friends because friendship is based on mutual liking（基于互相喜欢） and “give and take”. It takes t____  to develop.

人体内浆细胞和效应T细胞在结构上的差异，很可能体现在（ ）