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【单选题】
溶菌酶的溶菌作用机制是A.
裂解细胞壁肽聚糖骨架上的α-1，4糖苷键
B.
抑制细胞壁肽聚糖上四肽侧链与五肽桥的交联
C.
抑制细菌mRNA表达
D.
抑制细菌DNA转录
E.
破坏细胞壁上的磷壁酸
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【单选题】In the United States, old people who no longer have an income or suffer from a loss of physical abilities are often forced to give up living alone. They must leave their homes and depend on someone el...
A.
In the United States, old people who no longer have an income or suffer from a loss of physical abilities are often forced to give up living alone.
B.
They must leave their homes and depend on someone else to give them a place to live and to take care of their physical needs:
C.
This loss of independence is a major problem for the aged
【单选题】The passage is mainly about ______.
A.
the agriculture revolution
B.
the invention of labor-saving machinery
C.
the development of scientific agriculture
D.
the farming machinery in America
【单选题】— ________ invention the wheel is! — I can’t agree more. It is an invention that changed the world.
A.
What a useful
B.
How useful
C.
What a useless
D.
How useless
【简答题】Old people may choose to live alone for themselves and even embrace this living pattern. But in the deep part of their hearts, they must feel lonely. They need their children to stay with, to talk wit...
【单选题】He says that scientists and society have a shared moral ______ for the use made of scientific discovery and invention.
A.
application
B.
service
C.
responsibility
D.
consequence
【简答题】根据句意和首字母提示写出单词。 1. Tom is very helpful. He often gives his s_______ to the old people on the bus. 2. The flu (流感) is a big p_______ in the world now. We must be careful. 3. We all like our English tea...
【简答题】Must the old people ____________(speak) to politely?
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