这两道题里descend 和decline的区别 incline和decline的区别

这两道题里descend 和decline的区别 incline和decline的区别
some day software will translate both written and spoken language so well that the need for any common second language could___
a,descend b,decline c,deteriorate d,depress
为什么选b a不也是下降吗 都是什么意思
in addition to the rising birthrate and immigration,the__death rate contributed to the population growth
a,inclining b,increasing c,declining d,descending
a,c都有倾斜之意 有何区别 选d 不可以吗