Which pattern is used in the following outline when comparison is made？Point 1 Object 1 ➤ Object 2 Point 2 Object 1 ➤ Object 2 Point 3 Object 1 ➤ Object 2（）
A. The block pattern
B. The point-by-point pattern
C. The combination pattern
D. All above
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The main function of neurons is to（）
A. accept stimuli
B. transmit impulses
C. nutrition
D. protect
The nucleus is mainly composed of（）
A. nuclear membrane
B. caryoplasm
C. nucleolus
D. chromatin
The basic structure of an animal cell, including the（）
A. cell wall
B. cell membrane
C. cytoplasm
D. nucleus
The basic function of the cell membrane is to（）
A. maintain the integrity of the cellular morphology
B. maintain the relative stability of the intracellular environment
C. cell identification
D. carry on material exchange with the external environment
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