下列关于二氧化锰作催化剂的说法中，正确的是（ ） A．二氧化锰可以使过氧化氢很快

从日本大化改新的措施可以看出， 中国哪一时期文化对它影响很大：

A．秦汉时期

B．三国时期

C．隋唐时期

D．宋元时期

“大江东去，浪淘尽，千古风流人物。”苏轼这句词所体现出的突出特点是[ ]

A．内容丰富

B．豪迈奔放

C．别致清新

D．委婉真挚

Directions:This section consists of three groups of pairs listed in two columns, A and B. You are to match the one marked 1), 2), 3),4) or 5) in Column A with the one marked a, b, c, d or e in Column B. One point is given to each pair you match.
1) ______ language acquisition device (LAD)
2) ______ stimulus and response
3) ______ the discourse theory
4) ______ acquisition and learning
5) ______ the input hypothesis
a) The former refers to the subconscious process leading to the development of "competence"; the latter refers to conscious study and knowledge of grammatical rules.
h) A sort of mechanism or device which contains the capacity to acquire one’ s first language.
c) It assumes that humans acquire language in only one way--by understanding messages, or by receiving "comprehensible input".
d) It believes there is little difference between the first language acquisition process and the process of second language acquisition--only through communication discourses.
e) The former serves to elicit behaviour; the latter is triggered by the former.

表达式c3=c1.operator+(c2)或c3=operator+(c1,c2)还可以表示为______。

滑动轴承解体后，应检查乌金面上（）摩擦痕迹所占的位置是否正确，该处的刮研刀花是否被磨亮。

A、脱胎；

B、裂纹、局部剥落；

C、轴颈；

D、划伤。