题目内容

一个个体中含有不同染色体数目的三种细胞系,这种情况称为( )

A. 多倍体
B. 非整倍体
C. 嵌合体
D. 三倍体

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一种多基因遗传病的群体易患性平均值与阈值相距越近,说明群体易患性平均值( )

A. 越高,群体发病率也越高
B. 越低,群体发病率也越低
C. 越高,群体发病率越低
D. 越低,群体发病率迅速降低

一个正常男性核型中,具有随体的染色体是( )

A. Y染色体
B. 中央着丝粒染色体
C. 亚中央着丝粒染色体
D. 近端着丝粒染色体

染色质和染色体是（）

A. 不同物质在细胞周期中同一时期的表现形式
B. 不同物质在细胞周期中不同时期的表现形式
C. 同一物质在细胞周期中同一时期的表现形式
D. 同一物质在细胞周期中不同时期的两种存在形式

Complete the passage with the appropriate form of the collocations from the followingexpressions.1. to target a(n) audience 2.to launch a new campaign3. to sponsora sports event4. to project a(n) image 5. to endorse a(n) brand 6. to make a commercialSigning a celebrity and using their star status to 1) ___ is one of the standard advertising techniques. Tag Heuer, the watchmaker which 2) a number of , once had Tiger Woods under contract. Audrey Tautou has 3) for Chanel No5, which has been shown around the world.But choosing the celebrity who will 4) exactly the right _ is not always so easy, as several companies like Tag Heuer have found out. What happens when a company is about to 5) _ a new featuring a celebrity and it suddenly finds out that they are accused of a criminal offence or involved in a scandal? While there is no doubt that most celebrity endorsements do increase sales, more and more advertisers are turning to other less risky ways of 6) the ______ that they want to reach.