第二节 语法填空(共10小题；每小题1．5分，满分15分)

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填人一个适当的

词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为3l-40的相应位置上。

The most universal facial expression is, of course, the smile – its function is to show happiness and put people at    31    (easy). It does not always mean that we are     32   (true) happy, however. Smiles around the world can be false, hiding other feelings    33    anger, fear or worry. There are unhappy smiles. For example,    34   someone “loses face”, he smiles to hide it.    35   , the general purpose of smiling is to show good feelings.

From    36   time we are babies, we show    37   (happy) or anger by frowning. In most places around the world, frowning and turning one’s back to someone    38    ( show ) anger. Making a fist and    39   (shake) it almost always means that someone is angry and threatening    40    person.

在直流电路中，电感线圈和电容器各起什么作用？