单项选择题

A blinding （） of lightning flashed across the sky.

A．strip
B．stripe
C．band
D．streak

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单项选择题
In Wales, as in the rest of the United Kingdom, （） schooling begins at age 5 and ends at age 16.

A．obliged
B．compulsory
C．forced
D．compelling
单项选择题
（） complex organic catalysts originating in living cells.

A．Enzymes are
B．Enzymes while they
C．Enzymes
D．Enzymes which are
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