50岁以上髋关节骨关节炎病人有明显疼痛和运动障碍者，应首选()A．髋关节融合术 B．

读“海陆分布图”，回答下列问题：

（1）数字代表的大洲名称：①___________、④_______     ____、⑥_________    __。

（2）字母代表的大洋名称：B_______   ____、C______   _____、D____   _______。

（3）⑥⑦两大洲的分界线是_____            ______；②③两大洲的分界线是_____           ______。

（4）赤道横穿大陆的大洲是_______       ____、________   ___。

Do you sometimes put off doing your homework on a school night to watch TV？A new study says that middle school students who watch TV or play video games during the week do worse in school．The study also says that watching TV and playing video games on weekends don’t affect school performance that much．

“They could watch a lot on weekends and it didn’t seem to connect with doing worse in school，”said Dr．Iman Sharif of Children’s Hospital at Montefiore in New York．The study appears in the October issue of Pediatrics．Researchers drew their conclusions after surveying （调查）4，500 students in New Hampshire and Vermont middle schools．

To reach their findings，researchers didn’t look at grades or test scores．Instead，they asked students to rate their own performance on a scale ranging from “excellent’’ to “below”．

Other studies have found a connection between kids’ ability to learn and the amount of TV they watch．One study even found that kids with televisions in their bedrooms scored about eight points lower on math and language arts tests than kids without them．

What should fl kid do？The American Academy of Pediatrics recommends（推荐）that kids watch TV no more than two hours and that televisions be kept out of children’s rooms．Weekend viewing should be kept to four hours at most each day．

73．What could be the best title for the passage？

A．Study Says Students Shouldn’t Watch TV on a School Night

B．Watching TV Has an Effect on Children

C．Students Shouldn’t Watch TV

D．There Is a Connection Between Watching TV and Study

74．According to Dr．Iman Sharif，       ．

A．watching TV on weekends affects school performance

B．the less students watch TV on weekends，the better they do at school

C．watching TV on weekends doesn’t affect school performance

D．the more students watch TV on weekends, the worse they do at school

75．Which of the following is TRUE according to the passage？

A．Researchers did the survey by studying the students’ test scores．

B．Students’ learning ability has nothing to do with the amount of TV they watch．

C．Children with televisions in their rooms do better at school than those without them．

D．Children shouldn’t watch TV for more than four hours each day at weekends．

在生态环境影响评价中，（）常作为评价的重点，也是衡量评价工作是否深入或是否完成任务的标志。

A．植物的样方调查

B．敏感保护目标

C．生态系统生产能力

D．系统生物量

电烙铁能溶化焊料，使（）和导线牢固地连接在一起。

A、焊丝

B、焊油

C、导线

D、电子元器件

临床某医生想将A药混入B药中给予患者注射，但是不清楚这样做是否可以，特向药剂科咨询。以下药师关于药物配伍稳定性的叙述不正确的是（）

A.多种药物混合组合注射，由于各药物间的物理、化学等相互作用等原因，可影响医疗质量

B.可见的配伍变化，在混合后仔细观察，大多数是可以避免的

C.不可见的配伍变化潜在的影响药物对人体的安全性和有效性

D.药物的配伍变化均为立即反应，所以配伍后可及时观察到药物的可见配伍变化

E.注射液溶媒组成改变后，药物可能会生成沉淀