单选题 Improvements of all kinds ______ in television so that reception will be as close to perfect as possible.

【正确答案】 A

【答案解析】[解析] 谓语动词题。句意：电视在各个方面都在改进，以使接收的效果尽可能完美。谓语动词时态题：are constantly being made，constantly意为“不断地”，与进行时搭配意思恰当，且放在第一个助动词和第二个助动词之间，位置正确。