【名词&注释】
遗传性状(genetic character)、优越性(superiority)、二倍体(diploid)、受精卵(fertilized eggs)、遗传物质(genetic material)、无性生殖(asexual reproduction)、推理判断题
[单选题]9 .What has Barbara got in her suitcase?
A. . Shoes.
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举一反三：
[单选题]与无性生殖(asexual reproduction)相比，有性生殖的优越性表现在通过有性生殖
A. 可增加遗传物质重组的机会
B. 可保持亲、子代遗传性状的一致
C. 产生的子代都是二倍体
D. 可在短时间内迅速增加子代数量
[单选题]According to the text, what is the major cause of the flooding spam?
A. Companies rely on e-mail for communications.
B. More people in the world communicate by e-mail.
C. Many computer viruses contain spam e-mail.
D. More advertisers begin to promote sales through spam.
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