正确答案: A

. Shoes.

题目：9 .What has Barbara got in her suitcase?

解析：A

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举一反三的答案和解析：

[单选题]与无性生殖相比，有性生殖的优越性表现在通过有性生殖

可增加遗传物质重组的机会

解析：

有性生殖指由亲本产生雌雄配子，经过雌雄配子的结合，成为合子(受精卵)，再由合子发育成为新的个体的生殖方式。有性生殖过程中会发生广泛的基因的组合，增加了变异的几率。

[单选题]According to the text, what is the major cause of the flooding spam?

More advertisers begin to promote sales through spam.

解析：

推理判断题。由第二自然段中的As more and more advertisers turn to spam to sell their products, individual e-mail boxes are often flooded with spam e-mails.一句可知本题选D。