单项选择题

The President's absence from the dinner has （） the speculation about his health.

A．held on to
B．given rise to
C．lived up to
D．stood up to

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单项选择题
It was a freezing winter. The trees were （） and the branches were still.

A．bare
B．empty
C．vacant
D．blank
单项选择题
According to an investigation, automobiles are （） for two-thirds of the smog in American cities.

A．inferior
B．resistant
C．unconscious
D．responsible
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