What does the passage mainly discuss？
A. The research methods used by scientists.
B. Observation and human perception variation.
C. The relation between hypothesis and observation.
D. The human perceptual mechanism.
查看答案
【B5】
A. combat
B. rival
C. fight
D. defeat
It can be inferred from the last paragraph that human perceptual mechanism ______.
A. can never be changed
B. provides objective and straightforward way for observation
C. can provide some sort of correction on the basis of experience
D. always alters reality
【B4】
A. available
B. excessive
C. incredible
D. applicable
According to the writer, personal discoveries ______.
A. will give you one encouragement and direction
B. are helpful in finding the right information
C. are the most valuable part of one's personal education
D. will help one to successfully complete school assignments
微信支付 
支付宝支付