单项选择题


Questions 19 to 21 are based on the conversation you have just heard.

A．Six.
B．Seven.
C．Five.
D．Six or seven.
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单项选择题
A．People who live in Amazon tribes don’t think plants are the basis of the food pyramid.B．People who live in Amazon tribes don’t regard botany as a special branch of knowledge.C．People who live in Amazon tribes know all the properties of plants in the jungle.D．People who live in Amazon tribes give some special names to botany.
A．People who live in Amazon tribes don’t think plants are the basis of the food pyramid.
B．People who live in Amazon tribes don’t regard botany as a special branch of knowledge.
C．People who live in Amazon tribes know all the properties of plants in the jungle.
D．People who live in Amazon tribes give some special names to botany.
单项选择题
A．Lower prices.B．More choices.C．More competition.D．More companies.
A．Lower prices.
B．More choices.
C．More competition.
D．More companies.
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