智力群体差异包括( )。A．性别差异 B．年龄差异 C．种族差异 D．志向差异 E．

结合生活的实际，说说订立家庭公约有什么作用？（6分）

患者男，40岁。体检发现尿内出现多量管型，表示（）

A.泌尿系感染

B.肾盂有病变

C.肾实质有病变

D.肾髓质有病变

E.肾皮质有病变

在研究设计中，选择样本时不妥的是（）

A.样本量越大越好

B.严格遵循入选标准

C.严格规定总体的条件

D.按随机原则选取样本

E.根据课题内容确定样本量

Drug use among teens concerns many people in California. Advocates of the "Stop Drugs Now" program, which was piloted in public schools in five California counties last year, argue that the program should be used throughout the state to decrease drug use among teenagers.
Which of the following statements, if true, would most strengthen the argument of the advocates of "Stop Drugs Now" that the program should be expanded statewide ？（）

A. School programs are far less important than parental messages in influencing a teenager’s decision to use drugs.

B. Drug use among teens in the five counties where the "Stop Drugs Now" program was piloted has been dropping steadily for over a decade.

C. Teenagers at the public schools where the "Stop Drugs Now" program was piloted reported higher average levels of drug use than did teenagers at private schools in the same counties where the program was not piloted.

D. There is evidence that teenagers who start smoking at an early age are more likely to experiment with illegal drugs than teenagers who do not smoke.

E. The percentage of teenagers who reported using drugs at the schools where the "Stop Drugs Now" program was piloted dropped more in the last year than in any other year over the last decade.

最适于制备缓、控释制剂的药物半衰期为( )。

A．＜1小时
B．2～8小时
C．24～32小时
D．32～48小时
E．＞48小时