【单选题】
_______ the look on his face, he doesn’t t quite understand what the speaker is saying.
①
Judge by
②
Judging by
③
To judge by
④
To be judged by
【单选题】
Don’ t forget to put the book back on the shelf, _____?
①
do you
②
don’ t you
③
will you
④
won’ t you
【单选题】
类 Teacher 和 Student 是类 Person 的子类;
Teacher t;
Student s;
// t and s are all non-null.
if (t instanceof Person ){ s=(Student)t; }
最后一条语句的结果是:（ ）
①
将构造一个Student 对象;
②
表达式是合法的；
③
表达式是错误的；
④
编译时正确， 但运行时错误。
【单选题】
Don’t make faces in class.____________
①
Excuse me, I am wrong.
②
Certainly, I will.
③
That’s OK.
④
Sorry, I won’t do it again.
【单选题】
Hedidn’t________andsohefailedtheexamination.
①
workenoughhard
②
workhardenough
③
hardworkenough
④
hardenoughwork