单项选择题

It's now possible to record the existence of many stars which are ______ invisible.

A．hardly
B．heavily
C．permanently
D．thereby
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单项选择题
Alex Haley was ______ unheard of until he wrote the novel Roots.
A．truly
B．roughly
C．genuinely
D．practically
单项选择题
Accuracy is ______ to the programming of computers.
A．primary
B．elementary
C．fundamental
D．characteristic
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