About _______ gene-targeting drugs are a

阅读理解。

  I am Liu Mei. I am a girl. I am a middle school student. My cousin is the same age as me. She's really

nice, but she always borrows my things. Last week, she borrowed my math book and didn't return it. So

I couldn't do my homework. I don't want to have a fight with my cousin, because she's my best friend. I

don't know what to do.  

根据短文内容，判断正（T）误（F）。

( )1. Liu Mei is the same age as her cousin.

( )2. Her cousin never borrows Liu Mei's things.

( )3. Her cousin couldn't do her homework.

( )4. Her cousin borrowed Liu Mei's math book and returned it.

( )5. Liu Mei doesn't want to have a fight with her cousin because she's her best friend.

通过合并、收购同行业竞争企业以增强自身竞争实力的战略称为( )。

A．横向一体化战略

B．纵向一体化战略

C．前向一体化战略

D．后向一体化战略

I'm sorry I got caught in the traffic；_________, I could have been here sooner. [    ]

A. besides

B. although  

C. anyway  

D. otherwise

磁悬浮的核心技术得制备超导材料．有一种超导材料的化学式为Y₂BaCu₆O₁₀，它是以Y_mO_n、BaCO₃和CuO为原料经研磨烧结而成．假设此过程中所有元素的化合价不变，试填写以下空白：

（1）超导材料Y₂BaCu₆O₁₀是由______种元素组成的，Y_mO_n的化学式是：______．

（2）在合成该超导材料的同时还生成-种产物，该物质是______（写化学式）．

队员已获得控制活球后将球掷、拍或滚、在球触及另一队员之前再触及球为（）。