单项选择题

According to the passage, the exchange of medical ideas between east and west started ________.

A．thousands of years ago
B．decades of years ago
C．a few years ago
D．after the Second World War
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单项选择题
The author provides an example of smallpox inoculation in the last paragraph in order to show that _________.
A．inoculation reflects the medical interaction between west and east
B．Asian people learned immunization earlier than the Europeans
C．the Europeans learned immunization earlier than Asian people
D．immunization was practiced on people of upper class for some time in the eighteenth Britain
单项选择题
What conditions are needed for shrubs to become established
A．Ferns must take root.
B．The ground must be covered with grass.
C．More soil must accumulate.
D．Smaller plants must die out.
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