单项选择题
Masks were _______ when the Covid-2019 broke out.
A、demanding badly
B、in great demand
C、in assessment
D、 in the face of
Masks were _______ when the Covid-2019 broke out.
A、demanding badly
B、in great demand
C、in assessment
D、 in the face of
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下面关于比例等级符号图，说法不正确的是（ ）
A．使用点状符号的多少作为视觉变量表示数值
B．常以某种地理单元，如行政区域为基本地理统计区
C．使用点状符号的大小作为视觉变量表示数值
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How many students went to the hockey game? – （）
How many students went to the hockey game? – （）
A.None of them go to the hockey game.
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