日月贝的贝壳肌称为“（）”。

江珧的贝壳肌称为“（）”。

单选题查看答案

西施舌的贝壳肌称为“（）”。

单选题查看答案

日月贝的特征是左壳为（）。

单选题查看答案

日月贝的特征是右壳为（）。

单选题查看答案

The full title of the U.K. is the United Kingdom of （）and （）

填空题查看答案

public and private colleges and universities and community colleges offer（）.

单选题查看答案

（）is used for calling and replying,and for transmitting acknowleding and relaying distress alerts.

单选题查看答案

The way in which people address each other depends on their age, sex, social group and personal relationship. The English system of address forms frequently used includes first name, last name, title+last name, （）, and kin term.

单选题查看答案

Solid waste generation，and electricity and water consumption are costly and have their own set of environmental（）.

单选题查看答案