Skin is primarily made of two layers: the uppermost layer, the epidermis, which ________ a protection against the environment; and the dermis, the layer below the epidermis.
| A．is being served as | B．serves as | C．has served as | D．is served as |
更新时间：2023-11-28 18:47:19
|
相似题推荐
单项选择
|
适中
(0.65)
名校
【推荐1】The improvement of the course and teaching at a normal university should _____ students’ ability of teaching, vacation and linguistic competence.
| A．center around | B．refer to | C．serve as | D．prepare for |
您最近半年使用：0次
单项选择
|
适中
(0.65)
名校
【推荐2】Mangroves ______ the habitats for various birds and fish. Which of the following is NOT correct?
| A．serve as | B．regard as | C．work as | D．act as |
您最近半年使用：0次
单项选择
|
适中
(0.65)
【推荐1】A fully-grown blue whale _____ 110 feet in height and _____ several tons.
| A．is measured; weighs |
| B．measures; weighs |
| C．is measured; is weighed |
| D．measures; is weighed |
您最近半年使用：0次
单项选择
|
适中
(0.65)
【推荐2】You either starve to death or _________like Robinson Crusoe, _________for a boat which never _________.
| A．living; waiting; coming | B．live; wait; comes |
| C．living; wait; come | D．live; waiting; comes |
您最近半年使用：0次
单项选择
|
适中
(0.65)
【推荐1】We live in a beautiful cottage with a yard, which ______ 20 feet from side to side.
| A．measures | B．is measured |
| C．measured | D．has been measured |
您最近半年使用：0次
单项选择
|
适中
(0.65)
【推荐2】That suit ________ over 60 dollars.
| A．had costed | B．costed | C．is costed | D．cost |
您最近半年使用：0次
