单项选择题

A．An Indian summer brings warm days and nights.
B．An Indian summer occurs only in October.
C．An Indian summer is an annual phenomenon.
D．An Indian summer lasts many weeks.
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单项选择题
A．A more economical diesel fuel.B．Characteristics of a new type of fuel.C．Where a new energy source is located.D．How to develop alternative energy sources.
A．A more economical diesel fuel.
B．Characteristics of a new type of fuel.
C．Where a new energy source is located.
D．How to develop alternative energy sources.
单项选择题
A．How to care for precious metals.B．A standard unit for measuring weight.C．The value of precious metals.D．Using the metric system.
A．How to care for precious metals.
B．A standard unit for measuring weight.
C．The value of precious metals.
D．Using the metric system.
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