A:x≤3
B:x≥3
C:x≠3
D:x=3
为研究铁丝的粗、细对铁丝在氧气中燃烧的影响,下列实验能达到目的是( )
The old town has narrow streets and small houses _______ are built close to each other.
下列各句中划线词语运用恰当的一项是( )