oceans would be effective barriers to the movement of land animals. An elephant can't swim across the Pacific, after all. "可以推断, 大多数人认为陆地动物不能通过海洋迁移。

2. What does the underlined word "them" in Paragraph 3 refer to?

A. Biologists. 　　　　　 B. Australians.

C. The spiders　 D. The preys.

【解析】选C。代词指代题。根据第二段的表述, 尤其是第一句"Moggridgea rainbowi spiders can be found . . . "可知, them指代的是上一段中的蜘蛛。

3. How did the researchers conclude Australian and African spiders are from a common ancestor?

A. By comparing their genes.

B. By observing their living habits.

C. By making changes to their genes.

D. By studying their physical characteristics.

【解析】选A。细节理解题。根据第四段"They looked at the genes in seven Moggridgea rainbowi spiders from Kangaroo, and five species of Moggridgea spiders from South Africa. "可知, 研究者们是通过分析澳大利亚和非洲蜘蛛的基因而得出该结论的。

4. What could be the best title for the text?

A. These Spiders Traveled Globally to Hide Themselves

B. These Spiders Became More Adaptive When Traveling

C. These Spiders Crossed an Ocean to Australia for Survival

D. These Spiders Crossed an Ocean to Become Australians

【解析】选D。标题判断题。研究发现, 现在生活在澳大利亚的Moggridgea rainbowi spiders与非洲的Moggridgea spiders基因相同, 应起源于同一祖先。

For many, music is as important to the human experience as eating and breathing. We hear music everywhere-at home, the gym, parties and stores. But what kind of music do we prefer to listen to, and when and why do our musical preferences change?

The relationship between the change of seasons and musical preferences was the focus of a study led by psychologist Terry Pettijohn. He and his team based their research on a previous study that examined the relationship between popular music preferences and the Environmental Security Assumption. The results showed that over time, when social and financial conditions were more risky, the songs of the year that were slower, longer, more comforting and serious were most popular. And during periods in which social and financial conditions were generally stable, the result is opposite.

Building on these findings, Pettijohn and his team wondered if the Hypothesis could also be applied to the change of seasons. For college students, the participants in this study autumn begin at the start of the academic school year. Gone are the carefree days of summer, when school is out. When summer comes clocks fall back, stealing an hour of daylight, which feel like losing precious time. Winter means colder temperatures, shorter days, and, in many places in the country, snow. Spring,