【单选题】In heavily populated agricultural areas, ______ when crops fail.
A.
everybody takes to water sports
C.
a shortage of water will help
D.
more energy will be used
【单选题】When I got there, I found everybody ______.
【单选题】某动物的皮肤由多层细胞的表皮和真皮构成,表皮内有大量单细胞粘液腺,皮肤与肌肉紧密连接,皮下组织极少。下列动物中最符合以上描述的是:()
【单选题】装配图画法规定,两相邻零件的接触面和配合面之间画( )。
【单选题】When there is an important job, who is asked to do it?
【多选题】如果对某个研究课题进行主题检索时,可选择的检索字段有哪些
【多选题】载体介导的易化扩散的特征有__________。