题干

关于体内受精和早期胚胎培养的叙述,错误的是    (   )

A:排卵时,从卵泡内排出的是初级卵母细胞或次级卵母细胞

B:卵子完成受精的标志是卵黄膜和透明带间出现两个极体

C:卵黄膜封闭作用发生在精子接触卵黄膜时

D:卵子的发生是在雌性动物的卵巢内完成的

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答案(点此获取答案解析)

C

同类题1

配对阅读。左栏是五个人物想要做的事。右栏是七个节目、地方和服务的简介。请为每个人选择最合适的节目、地方或服务。

 ____ Mrs. Smith wants to send her daughter to take some piano lessons during the coming summer holiday.

____ Sam and his girl friend want to spend the weekend to watch something new. They both like dancing.

____ Dannel wants to buy some newspaper to read so that he can improve his English. 

____ Miss Black wants to come to Beijing for the first time in August. She wants to enjoy the real Beijing Opera very much.

____ Tony and his colleagues will have a trip in Guangzhou next week. They need to rent a car and a driver who understands English. 

A.Watch Your Neck

This modern ballet is telling the story of “Dracula” which is the classic novel by Irish playwright Bram Stoker.

Time: 8:30 pm

February 2~9    Tel: 98558588

B.Children's Activity Center

Tel: 66589982

    Add: No.2 Zhongshan Road. (Singing lessons, piano lessons and dancing lessons. )

C.Art Show

A total of 10 artists living close to each other are jointly giving an art exhibition.

D.Peking Opera
Mei Lanfang's brave fighting against the Japanese during the war of Resistance against Japanese will open your mind.

E.Foreign Book Center

More and more increasing learning English books and newspapers, CDs. etc.

F.The Changcheng Hotel

Five star hotel. Looking for much experienced receptionists. Tel: (010)55883326 

G.Car-Hire Service

12 seat Forit transit van for hire in Zhujiang Business and Private Hire. We have English-speaking drivers.