单项选择题

Should English classes be ______at the elementary or primary school level in countries where it is not the native language

A required
B. necessary
C. selected
D. permanent
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单项选择题
Chocolate manufacturers blend many types of beans to yield______ and color desired in the final product.
A．the shape
B．the flavor
C．the function
D．the brand
单项选择题
The______ choice for a consumer, therefore, is the choice among the available ones that will enable him or her to maximize utility.
A．optimal
B．optional
C．optical
D．optimistic
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