单项选择题

According to the passage, which of the following is important in explaining a muscle movement

A．The flow of blood to the muscles.
B．Classical conditioning.
C．Protein interactions.
D．The entry of unpleasant stimuli through the cell membrane.
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单项选择题
The last sentence in the last paragraph implies that ______.
A．it is difficult to cool the engine
B．the driver can only open the hood on a hot summer day
C．the driver has to be very patient
D．it takes a long time to open the hood in summer
单项选择题
The author implies that which of the following is the type of scientific explanation most likely used by a molecular biologist
A．Experimentation.
B．Reduction.
C．Interaction.
D．Generalization.
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