单项选择题

The elderly Russians find it hard to live on their state ________.

A．pensions
B．earnings
C．salaries
D．donations
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单项选择题
The two most important ________ in making a cake are flour and sugar.
A．elements
B．components
C．ingredients
D．constituents
单项选择题
An urgent social challenge in the future will be to ensure that science and technology develop in this direction.
A．inclusively
B．exclusively
C．cohesively
D．accidentally
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