[单项选择]A. Some sea creatures developed vertebrae.
B. The first giant squid was captured.
C. Some sea creatures shed their shells.
D. Sea life became more intelligent.

[单项选择]Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.
A. having
B. had
C. have
D. to have

[单项选择]The baby monkey is much more developed at birth than the human baby. Almost from the moment it is born, the baby monkey can move around and hold tightly to its mother. During the first few days of its life the baby will approach and hold onto almost any large, warm, and soft object in its environment, particularly if that object also gives it milk. After a week or so, however, the baby monkey begins to avoid newcomers and focuses its attentions on “mother”—the real mother or the mother-substitute (母亲替代物). During the first two weeks of its life warmth is perhaps the most important psychological thing that a monkey mother has to give to its baby. The Harlows, a couple who are both psychologists, discovered this fact by offering baby monkeys a choice of two types of mother-substitutes—one covered with cloth and one made of bare wire. If the two artificial mothers were both the same temperature, the little monkeys always preferred the cloth mother. However, if the wire model was hea
A. Warmth
B. Milk
C. Contact
D. Trust

[填空题]Teaching involves more than leadership. Some of the teacher’s time and effort is {{U}} (36) {{/U}} toward instruction, some toward evaluation. But it is the teacher us a group leader who creates an {{U}} (37) {{/U}} organizational structure and good working environment so that instruction and evaluation activities can take place. A group that is {{U}} (38) {{/U}} disorganized, unclear about its goals, or {{U}} (39) {{/U}} fighting among its members will not be a good learning group. The leadership pattern includes helping to form and maintain a positive learning environment so that instruction and evaluation activities can take place. On the first day of class, the teacher faces a room filled with {{U}} (40) {{/U}} . Perhaps a few closely {{U}} (41) {{/U}} groups and friendships already exist. But there is no sense of group unity, no set of rules for {{U}} (42) {{/U}} in the group, no feeling of belonging. If teachers are successful leaders, they will help students develop

[单项选择]How’s this for unintended consequences Some of the biggest beneficiaries(受惠者) of the women’s movement have been married men. According to a new study by the Pew Research Center, married men have a 60% higher average household income than they did in 1970, even adjusted for inflation. Unmarried men, on the other hand, only got a 16% bump.
One reason for the rise is that more men are marrying women who make more money than they do, mainly because there are more high-income women to go around. In 1970, just 4% of men ages 30 to 44 had wives who brought in more money than they did. By 2007, more than a fifth of men in that age range had wives who out-earned them. Members of this thriving demographic(人口统计学的) are effectively doubling their income or more when they wed, without doubling their costs.
Aside from the increase in white-collar women, the other trend behind the Pew numbers is that marriage rates have declined most sharply among the least educated
A. had even less education
B. had lower marriage rates
C. had slower growth in household income
D. had more trouble adjusting for inflation