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，根据上下文填入适当的词语，或使用括号中的词语的适当形式填空。

Marty has a muscle disease that sometimes makes him very weak and he can’t run or climb stairs as quickly as other people. The doctors don’t know___31___(exact)what is wrong with him.    32  (luck),Marty has learned to adapt to his disability. He used to dream 33__

one day being a famous football player and   34   (represent) his country in the World Cup.

He doesn’t look any different from    35   people. So sometimes kids laugh at him   36 

he gets out of breath. Life is much   37  (easy) at high school than it was at primary school.

Even when he is made fun of, he does not get   38   (annoy).Disabled   39  he is, Marty has become stronger and more independent. He suggests that we normal people should give the disabled   40  (encourage) rather than laugh at them.

旋转刮板式换热器的主要特点是可使高黏度物料获得高的（）。可用作黏稠、（）和热敏性物料的换热器。