下列是对正常人的受精卵染色体数目分析的结果，能发育成女性的是

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问题选择题

下列是对正常人的受精卵染色体数目分析的结果，能发育成女性的是（　　）

A．22对+XY

B．22对+XX

C．22条+XY

D．22条+XX

答案

男女体细胞中都有23对染色体，有22对染色体的形态、大小男女的基本相同，其中有一对染色体在形态、大小上存在着明显差异，这对染色体与人的性别决定有关，称为性染色体；女性体细胞中的性染色体形态大小基本相同，称为XX染色体，因此正常女性体细胞中染色体的组成是22对+XX，男性体细胞的性染色体中，较大的一条命名为X染色体，较小一条称为Y染色体，因此正常女性体细胞染色体组成的是22对+XX．
故选：B

阅读理解

ENJOY YOUR FAVORITES IN STAR CINEMA

September
Fri-Sun
Voldemort:14:00; 16:00
Lord of the Rings（Ⅱ）The Two Towers:14:00; 16:00; 20:00; 22:00
Mon-Thurs
The Lion King, Shrek（Ⅱ）:12:00; 14:00; 16:00; 20:00

October
Fri-Sun
Goblet of Fire:14:00; 16:00
Lord of the Rjngs（Ⅲ）The Return of the King:14:00; 16:00; 20:00; 22:00
Mon-Thurs
Lord of the Rings（Ⅱ）The Two Towers:12:00; 14:00; 16:00; 20:00
Voldemort:12:00; 14:00; 16:00

Tickets must be booked被预定 any time up to 30 minutes before the film starts. Ticket holders are given seat numbers.
Drinks are provided. Food may be bought from the shop and eaten in the area provided outside the cinema.
Ticket price: Adults: $16; Children under 6:$6; students under 16:$10
Smoking is not allowed anywhere in the cinema. Mobile phones must be kept off.

小题1:What film can you see on a Saturday night in October?

A．Lord of the Rings（Ⅲ）The Return of the King..

B．Lord of the Rings（Ⅱ）The Two Towers.

C．The Lion King, Shrek（Ⅱ）.

D．Voldemort.

小题2:When can you see the film Voldemort?

A．Tuesday, October, 4 p.m.