___D__ some mammals came to live in the sea is not known.[ ] A.Which B.Since C.Although D.How为什么不用which 选D 但选how是做known的宾语?

___D__ some mammals came to live in the sea is not known.[ ] A.Which B.Since C.Although D.How为什么不用which 选D 但选how是做known的宾语? how some mammals came to live in the sea is not known, （共40题、总分40分）1.( ) some mammals came to live in the sea is not known (本题分 英语翻译Effect of dietary laurate on lipid accumulation and vitality in juvenilePagrus major.Abstract:Based on the fact that medium-chain triglycerides suppress accumulation of reserved lipids in mammals and some fishspecies,the effect of dietary The Largest Mammals in the World Are dolphins fish or mammals 翻译 来做几道英语选择题．说明理由1.but man and some monkeys are the only mammals ( )can see colorA.which B.who C.when D.that2.like ( ) animals ,dogs seebest when things moveA.for B.with C.as D.to3.the animals they hunt seem to know( ) .A.the 1It is never harmful ___ you to be polite and gentle to others and___,as is often the cased,you can get what you want.A to;thus Bfor,thus;Cof;therefore Dwith;however2It still puzzles the sceince world why some mammals produce their young____ and hatc Human being are natural enemies of marine mammals. 什么意思? Mammals give birth to their young. 什么意思 does anyone know when mammals first appeared on earth 47.How much do you think that vase ___d__?A.is cost B.used C.was paid for D.cost为什么选D? 下列可以正确表示字符型常量的是___D__. A、297 B、a C、 D、' '请详细解释一下,谢谢~~ some some some some some