题目内容：

The unquestioned role of a student is to learn as much as possible through whatever means it takes to acquire knowledge. Teachers and professors are human beings and are therefore not perfect. No one knows the correct answer to every question even when you limit the questions to a certain field of study. Having certain skepticism(质疑) about what they are being taught can help students to make the teachers even better by correcting mistakes and misinformation.

Students certainly have a huge role in their own abilities to learn. Teachers should act more as guides along the way rather than try to force each student to learn. The best teachers in the world cannot teach an unmotivated student. If the teacher, for whatever reason, cannot motivate the student, then the student must somehow find a way to motivate himself or herself.

One method of doing this is by becoming an active rather than a passive student. The more the student involves himself or herself in the act of studying, the better he or she can learn. One of the best ways to become more active is simply to ask the teacher or professor questions. Students who passively sit in a classroom and take everything that the teacher says for granted are not fully using their mental capacities to learn.

Better education comes from teachers who are able to get their students to think about a subject rather than merely absorb a certain amount of. information. Having a healthy skepticism can improve a student's ability to both think and absorb knowledge in a learning situation.

Teachers are human beings and no one is one hundred percent right all of the time, even in a classroom situation. Perhaps a teacher would simply unconsciously say the wrong word or pass on some misinformation that the teacher truly believed was correct. A student's question could prevent an entire classroom from becoming confused or misinformed.

There is of course a fine balance between a student having a healthy skepticism and just being a downright skeptic. But with the proper attitude toward learning and a little skepticism, both the students and teachers can improve upon the learning process and maximize learning efficiency.

1.Which of the following is the author's main argument?

A. Passive learning results from passive teaching in class.

B. A student's ability plays a huge role in the learning process.

C. A healthy skepticism fully depends on students' motivation and ability.

D. A healthy skepticism and proper attitude contribute to effective learning.

2.Being passive learners, the students ________.

A. use little of their mental ability while studying

B. seldom involve themselves completely in learning

C. can hardly tell the right from the wrong in class

D. simply ask their teachers questions without thinking

3.According to the passage, a good teacher should ________.

A. help the unmotivated students patiently

B. instruct students in the learning process

C. make no mistakes in the teaching process

D. answer all the questions raised by students

4.The author will most probably agree that ________.

A. keeping skepticism to a certain degree is important

B. having a good attitude can ensure the learning process

C. taking everything for granted makes a student learn nothing

D. a teacher's ability can be improved by encouraging doubts