[单项选择]A. It’s hot. B. It’s cold.
C. It’s sunny. D. It’s rainly.

[简答题]在上题中在S座位有时还有第3个基因Su，Su对S和s都是隐性的，仅在纯合时才能够测出。若S、s和Su的频率分别为p、q和r，预期S、Ss、s和Su表型频率是多少

[单项选择]Guthrie’s contiguity principle offers practical suggestions for how to break habits.
One application of the threshold method involves the time young children spend on academic activities. Young children have short attention spans, so the length of time they can sustain work on one activity is limited. Most activities are scheduled to last no longer than 30 to 40 minutes. However, at the start of the school year, attention spans quickly wane and behavior problems often result. To apply Guthrie’s theory, a teacher might, at the start of the year, limit activities to 15 to 20 minutes. Over the next few weeks the teacher could gradually increase the time students spend working on a single activity.
The threshold method also can be applied to teaching printing and handwriting. When children first learn to form letters, their movements are awkward and they lack fine motor coordination. The distances between lines on a page are purposely wide so children can fit the letters into the
A. inform
B. persuade
C. debate
D. narrate

[单项选择]From the 1960s, international terrorist crimes, such as the hijacking of passenger aircraft, political assassinations and kidnappings, and urban bombings, constituted a growing phenomenon of increasing concern, especially to Western governments. Most terrorist groups are associated either with millenarian revolutionary movements on an international scale (such as some Marxist organizations) or with nationalist movements of particular ethnic, religious, or other cultural focus.
Three broad categories of terrorist crime may be distinguished, not in legal terms, but by intention. Foremost is the use of violence and the threat of violence to create public fear. This may be done by making random attacks to injure or kill anyone who happens to be in the vicinity when an attack takes place. Because such crimes deny by virtue of their being directed at innocent bystanders, the unique worth of individual, terrorism is said to be a form of crime that runs counter to all morality and so unde
A. some Marxist organizations
B. millenarian revolutionary movements
C. nationalist movements of particular religious focus
D. heads of state and members of governments

[填空题]The employer gave his (accept)（）to the worker’s suggestions.