题目

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 China successfully landed the Chang'e 4 lunar probe(月球探测器)on the far side of the moon on January3,2019, becoming the only country in history(touch) the lunar surface unseen bythose on Earth. The far side of the moon has been seen and mapped(previous) by astronauts of the Apollomissions. But it is the first time that the moon's far side(set) foot on by any spacecraft, andthe successful landing of Chang'e 4 is seen as a major milestone in space (explore). The Chang'e 4 spacecraft consiststwo 某同学连接的电路如图所示，电源电压保持不变，他将开关闭合后，将滑动变阻器的滑片P从中点向左端滑动的过程中，下面的说法中正确的是（ ）A．电压表示数不变，电流表示数增大，灯泡亮度不变B．电压表示数减小，电流表示数减小，灯泡亮度不变C．电压表示数不变，电流表示数增大，灯泡亮度变暗D．电压表示数增大，电流表示数减小，灯泡亮度变亮