问题 单项选择题

叶绿体是植物进行光合作用的细胞器,下面有关叶绿体的叙述正确的是()

A.在囊状结构的薄膜上分布有吸收光能的色素

B.叶绿体的外膜和内膜上分布有少量的色素

C.与光合作用有关的酶都分布在叶绿体基质中

D.CO2能穿过内外膜和类囊体膜进入类囊体腔中被利用

答案

参考答案:A

解析:叶绿体中色素分布于囊状结构的薄膜上;与光合作用有关的酶分布于叶绿体的囊状结构薄膜和叶绿体基质中;CO2能穿过叶绿体内外膜进入叶绿体基质参与光合作用,不需要穿过类囊体膜。考点:考查叶绿体的结构。点评:难度中等,熟记光合作用的具体结构及相应的生理变化。

填空题



Every human being is fallible; we make mistakes. In America when a mistake has been made, it is considered fitting for the person (1) to acknowledge his or her error and to apologize to anyone who has been inconvenienced. Even (2) are expected to admit their mistakes and apologize for them. Trying to (3) a mistake and denying your guilt are considered to be indicative of serious (4) .
If you make a mistake that (5) a group of people, a public apology is considered the best method for (6) . If the mistake was a serious one, or if some people were inconvenienced more than others, then the (7) should follow the public apology with private ones to (8) .
It is especially important for executives and company heads to be able to admit their mistakes. Sometimes leaders are afraid that if they (9) , they will lose the respect of their employees. Actually (10) — if you are honest with your employees and yourself, (11) , and show that you are willing to accept blame when you make a mistake, then your employees will be (12) you. They will also be more likely to admit their own mistakes.
If you (13) one person, it is usually best to apologize to that person alone, unless your mistake (14) by a large group of people. For example, if Leonard (15) to Mr. Todd during a committee meeting, it would be (16) for Leonard to apologize to Mr. Todd at the next committee meeting. If the (17) created by the initial mistake is public, then the apology should be public. However, if Leonard raised his voice to Mr. Todd when only the two of them (18) , he may apologize privately. Notice as well (19) the apologies are. As soon as you realize you have made a mistake, you should (20) .

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