单项选择题

Astronomers (have increases) their observation powers (greatly) through (improved) high-powered telescope, computer simulations and (coordinate) with other scientists.

A．have increases
B．greatly
C．improved
D．coordinate
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单项选择题
The departments concerned shall (listen) and accept (criticisms) and rational suggestions (regarding) the protection of (women's) rights and interests.
A．listen
B．criticisms
C．regarding
D．women's
单项选择题
In a sense, farmers began primitive genetic engineering (at the dawn of) agriculture, (which) they kept seeds (from) their best plants, gradually (improving) the quality of successive generations.
A．at the dawn of
B．which
C．from
D．improving
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