阅读理解。
For a clearer picture of what the student knows, most teachers use another kind of examination in
addition to objective tests. They use "essay" tests, which require students to write long answers to broad,
general questions such as the following: "Mention several ways in which Benjamin Franklin has influenced
thinking of people in his own country and in other parts of the world."
One advantage of the essay test is that it reduces the element of luck. The student cannot get a high
score just by making a lucky guess. Another advantage is that it shows the examiner more cares about the
student's ability to put facts together into a meaningful whole. It should show how deeply he has thought
about the subject. Sometimes, though, essay tests have disadvantages, too. Some students are able to write
rather good answers without really knowing much about the subject, while other students who actually
know the material have trouble expressing their ideas in the essay form.
Besides, in an essay test the student's score may depend upon the examiner's feelings at the time of
reading the answer. If he is feeling tired or bored, the student may receive a lower score than he should.
Another examiner reading the same answer might give it a much higher mark. Because of this, the objective
test gives each student a fairer chance, and of course it is easier and quicker to score.
Whether an objective test or an essay test is used, problems arise. When some objective questions are
used along with some essay questions, however, a fairly clear picture of the student's knowledge can usually
be gotten.
1. What may have been discussed in the previous (先前的) paragraphs?
A. The essay test.
B. How teachers test their students.
C. How students write their essays.
D. The objective test.
2. The essay test is preferred because _____.
A. it shows more about the student's understanding of the subject
B. it tests the student's knowledge of the material as well as his expression of ideas
C. it gives each student a fairer chance
D. its scoring may be influenced by the examiner's feelings
3. The underlined word "this" in the third paragraph refers to the fact that _____.
A. students may receive a lower score in an essay test
B. another examiner usually gives the answer a higher mark
C. different examiners may give the same essay different scores
D. the objective test gives each student a fairer chance
4. According to the passage, which of the following statements about the objective test is NOT true?
A. It is more objective than the essay test in terms of scoring.
B. It allows the students to guess the correct answer without really knowing the material.
C. It shows the student's ability to think bout difficult problems.
D. It is easy and quick to score.
=______．
，
，即sinx+cosx在(-∞，+∞)内有界，因为有界变量与无穷小量的乘积仍为无穷小量，所以原极限为零．