问题 选择题

下图甲为果蝇体细胞中染色体结构模式图,图乙为该个体减数分裂形成配子时某细胞中的两对染色体。下列说法正确的是

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A.图乙减数分裂完成后,若形成Da的卵细胞,则同时产生的三个极体的基因型是Da、dA、dA

B.基因A、w之间遗传时遵循基因的自由组合定律

C.图甲含有两个染色体组,图乙含有四个染色体组

D.图乙减数分裂完成后,若形成了Dda的卵细胞,其原因只是减数第一次分裂后期同源染色体①和②没有分离

答案

答案:B

完形填空

阅读下面短文,并根据短文后的要求答题(请注意问题后的字数要求)。

[1]Perhaps you are an average student with average intelligence. However, you can receive better grades if you want. Yes, even students with average intelligence can be top students without additional work. Here's how:

[2]Plan your time carefully. Make a list of your weekly tasks. Then make a schedule of your time. Be sure to set aside enough time to complete your normal reading and work assignments. Of course, studying shouldn't occupy all of the free time on the schedule.

[3]Make good use of your time in class. Listening to what the teacher says in class means less work later. Take notes to help you remember what the teacher says.

[4]Skim before you read. Look over a passage quickly before you begin to read it more carefully. As you preview the material, you get some idea of the content and how it is organized. Later when you begin to read, you will recognize less important material and you may skip some of these portions. Skimming helps double your reading speed and improve your comprehension as well.

[5]         .Go over your notes as soon as you can after class. Review important points mentioned in class as well as points you remain confused. If you know what the teacher will discuss the next day, skim and read that material, too. If you review your notes and textbook regularly, the material will become more meaningful and you will remember it longer. Regular review leads to improved performance on tests.

[6]Develop a good attitude towards tests.The purpose of a test is to show what you have learned about a subject. The world won't end if you don't pass a test, so don't worry excessively (过分地) about a single test.

[7]There are other techniques that might help you with your studying. Improving your studying habits will improve your grades.

小题1:What’s the best title of the passage? (no more than 8 words)

                                                                            

小题2:Please translate the underlined sentence in paragraph one into Chinese.

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小题3:Please fill in the blank in the fifth paragraph with proper words. (no more than 4 words)

                                                                             

小题4:According to the passage, how can an average student improve his/her grades?(no more than 6 words)

                                                                             

小题5:What does the word “it” (line 4, paragraph 5) probably refer to? (no more than 3 words)

                                                                             

选择题