单项选择题

The author’s attitude toward noise would best be described as （）.

A. unrealistic
B. traditional
C. concerned
D. hysterical

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问答题

Write a note of about 50-60 words based on the following situation: You are a student majoring in Civil Engineering and want to take a course of Summer Field Trip of the English Department. Write the professor a note expressing your interest and apply for the course. Marks will be awarded for content, organization, gram mar and appropriateness.

单项选择题

DNA fingerprinting can be unreliable when （）.

A. the methods used for blood-cell calculation are not accurate
B. two different individuals of the same ethnic group may have the same DNA fingerprinting pattern
C. a match is by chance left with fingerprints that happen to belong to two different individuals
D. two different individuals leave two DNA samples