【简答题】()是软体动物的一个显著特征,软体动物的身体可划分为()、()和()三部分。
【简答题】3 Word Building In English, the prefixes co, con-and com-all mean" together; with, and they are used to form new words, as is shown in the following table. Prefixes Meanings of Prefixes ...
【简答题】The best title of this text might be______. [A] Home-schooling : A Growing Trend [B] Home-schooling : A Better Choice [C] Home-schooling: A Way to Success [D] Home-schooling: A New Method of Education
【单选题】The word "verandah" in the interview most likely means ______
A.
a window through which one can look into the garden
B.
a special type of bedroom
C.
an open area with a floor and a roof that is built on the side of house
D.
a kitchen separate from the main building
【多选题】适用于一些品质稳定的工业制成品或经过科学加工的初级产品的交易方式有()。
【单选题】下列有关软体动物叙述不正确的是( )
B.
牡蛎等生物存在性反转现象,其性别随环境改变而改变
C.
其产卵和发育分为卵囊或卵块内发育、水中发育两种
D.
软体动物多数精子是鞭毛型,卵子一般是椭圆形和梨形