单项选择题

Many of the conditions that population pressures- overcrowding, unemployment, poverty, hunger and illness______ lead to dissatisfaction.

A．bring forward
B．give rise to
C．feed up with
D．result from
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单项选择题
To give you a general idea of our products, we enclose the catalogues showing various products handled by us with detailed ______ and means of packing.
A．specimens
B．inspections
C．samples
D．specifications
单项选择题
To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world market demand.
A．improve
B．enhance
C．guarantee
D．gear
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