如果一个验电器的两个金属箔片因带电张开，则这两个金属箔片一定（   ）

    The earth moves round the sun, and the moon goes round the earth. When our part（部分）of the earth turns to the sun, it is day, When our part of the earth turns away from the sun, it is night. The sun is much bigger than the moon. But sometimes the moon looks bigger than the sun, because it's much nearer to the earth. The sun is very bright. It gives a very strong light. The moon looks quite bright, too. But it doesn't give any light at all. The moon looks much bigger and brighter than the stars. But actually（事实上）, the stars are much bigger and brighter than the moon. They look smaller than the moon because they're much farther away from us.

2016年3月，德国的Metro超市在超市里设置了小型温室种植蔬菜，称其为“欧洲第一个商场内的农场”，这种垂直农场设备可以让蔬菜在超市里“边种边卖”。 “商场内的农场”的发展，可能产生的影响是（    ）