问题 选择题

下面对高等动物通过减数分裂形成生殖细胞以及受精作用的描述不正确的是[ ]

A.卵细胞获得了初级卵母细胞1/4的细胞质

B.减数第一次分裂使细胞中染色体数目减半

C.减数分裂和受精作用保证前后代体细胞染色体数目的恒定

D.受精卵中的染色体一半来自精子,一半来自卵细胞

答案

答案:A

阅读理解

Oral English , also known as spoken English , is the form of English that is used when people are speaking to one another . Students who are learning English as a second language often feel uncomfortable using oral English because they fear that they will not be understood . It is important that a person who is learning to speak English practice using the language .   小题1:  

Listening is important to learning spoken English .    小题2:  Pay attention to conversations that happen around you while you are shopping . Watch the news every evening while you have supper .

Part of learning spoken English is in understanding how English words are formed . Watch the mouths and tongues of native English speakers carefully .                         小题3:    Notice how the lips form certain sounds . Imitate ( 模仿)what you see .

Rent movies over the weekend . Try to follow the story line of comedy shows .   小题4:    Not having to respond in English lets you concentrate on simply understanding what is being said . Understanding how English is used in conversation will help you to better communicate in the language .

  小题5:    When you are reading , pay more attention to the correct pronunciation of the words you are reading rather than comprehension of each word . Read easy books that were written for children . Reading simple books takes away the frustration of sounding out hard words .    

A.Read out loud for twenty to thirty minutes every day .

B.Listen to English radio while getting ready in the morning .

C.Observe how much the mouth is opened to say certain words .

D.Find a friend or teacher who is willing to help you learn English .E. Repeat the conversations several times to increase your speaking speed .

F. Watching TV shows and movies allows you to hear English used in conversation .

G. The more a person practices his or her skills , the more easily speaking English will become .

解答题