Ⅰ.指出下列句子中不定式作表语时在句中的含义：
A．解释主语的内容
B．表示义务与责任
C．表示计划与安排
D．表示必然与不可避免
( )1.Those who break the law are to be punished.
( )2.My goal is to let more people live a more comfortable life.
( )3.The foreign teacher is to arrive the day after tomorrow.
( )4.You are to support your old parents in their daily life when they are old.
【答案】1.D 2.A 3.C 4.B
