It is bad manners to s____ your legs while eating.
Health is important for us teenagers, so we should eat more vegetables such as to keep healthy.
我会选择恰当的量词填空。
棵 条 个 座 位 幅
一____大峡谷 一____大拐弯 一____雪山
一____画卷 一____大树 一____科学家
如图,△ABC中,D、E分别是BC、AC的中点,BF平分∠ABC,交DE于点F,若BC=6,则DF的长是( )
下列各句中,没有语病的一句是( )