题干

短文改错。

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有10处语言错误,每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1.每处错误及其修改均仅限一词;2.只允许修改10处,多者(从第11处起)不计分。

    It is Mother's Day today.Though it's a western festival, it's popular in China now.

    Mom has a full-time job,so she has to do most of the houseworks.She is a great mother.Both Dad or I planned to do something on Mother's Day.We get up early in the morning.Dad cleaned the house,and then went on shopping.When he came back,I found a bunch of flowers in her hand.I asked Mom to stay in the sitting room and I cooked in kitchen.The dishes what I cooked were Mom's favoritiest.At dinner,we said to her,“Happy Mother's Day!”Mom was grateful and moving.

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答案(点此获取答案解析)

It is Mother's Day today.Though it's a western festival, it's popular in China now.

Mom has a full-time job, sobut

同类题4

果蝇的灰体(E)对黑檀体(e)为显性;短刚毛和长刚毛是一对相对性状,由一对等位基因(B,b)控制.这两对基因位于常染色体上且独立遗传.用甲、乙、丙三只果蝇进行杂交实验,杂交组合、F1表现型及比例如图:

(1)根据实验一和实验二的杂交结果,推断乙果蝇的基因型可能为____ 或____ .若实验一的杂交结果能验证两对基因E,e和B,b的遗传遵循自由组合定律,则丙果蝇的基因型应为____ .

(2)实验二的F1中与亲本果蝇基因型不同的个体所占的比例为____ .

(3)在没有迁入迁出、突变和选择等条件下,一个由纯合果蝇组成的大种群个体间自由交配得到F1,F1中灰体果蝇8400只,黑檀体果蝇1600只.F1中e的基因频率为____ ,Ee的基因型频率为____ .亲代群体中灰体果蝇的百分比为____ .

(4)灰体纯合果蝇与黑檀体果蝇杂交,在后代群体中出现了一只黑檀体果蝇.出现该黑檀体果蝇的原因可能是亲本果蝇在产生配子过程中发生了基因突变或染色体片段缺失.现有基因型为EE、Ee和ee的果蝇可供选择,请完成下列实验步骤及结果预测,以探究其原因.(注:一对同源染色体都缺失相同片段时胚胎致死;各型配子活力相同)实验步骤:

①用该黑檀体果蝇与基因型为____ 的果蝇杂交,获得F1

②F1自由交配,观察、统计F2表现型及比例.

结果预测:

Ⅰ.如果F2表现型及比例为____ ,则为基因突变;

Ⅱ.如果F2表现型及比例为____ ,则为染色体片段缺失.