题目内容
【题目】书面表达
最近来自美国的外教史密斯先生任你们班的口语老师。请你根据提示信息,用英语写一篇短文,介绍这位新老师。
外貌 | 戴眼镜;年轻、英俊;中等身材 |
性格 | 幽默;外向;乐于助人 |
教学方面 | 知识丰富;课堂生动、有趣 |
与学生的关系 | 与学生关系融洽,在学习方面要求严格 |
参考词汇:中等身材 be of medium height
注意:1. 词数:100左右;
2. 可适当增加细节,以使行文连贯;
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【答案】
【参考范文】
Our new spoken English teacher, Mr. Smith, comes from America. He is a handsome young man with thick glasses and is of medium height. He becomes popular among the students because he is humorous and outgoing. Whenever we have trouble in our studies or life, we’d like to turn to him because he is always ready to help others. All of us like his lessons because he has rich knowledge and can make his classes lively and interesting. Although he is easy to get along with, he is very strict in our studies. We like such a teacher and believe we can make greater progress with him teaching us English.
【解析】略
【题目】某生物兴趣小组对学校草坪的某种雌雄同花的植物进行了遗传学研究,发现该种植物的花色有红色和白色两种。他们查阅资料后发现,该对性状受一对遗传因子控制。为了对该对性状做进一步研究,该小组随机取红花和白花植株各60株均分为三组进行杂交实验,结果如表所示:
组别 | 杂交方案 | 杂交结果 |
A组 | 红花×红花 | 红花︰白花=14︰1 |
B组 | 红花×白花 | 红花︰白花=7︰1 |
C组 | 白花×白花 | 全为白花 |
(1)根据 组结果,可以判断 色为显性.
(2)试解释A组结果没有出现3︰1性状分离比的原因 .
(3)B组亲本的红花中,纯合子与杂合子的比例为 .
(4)要判断B组杂交结果中某红花植株是否为纯合子,最简单的方法是 .