问题 单项选择题

正常精液pH为

A.4.0~5.0

B.5.0~6.2

C.6.2~7.2

D.7.2~7.8

E.7.8~8.0

答案

参考答案:D

解析:用精密pH试带或酸度计在射精后1h内测定。正常精液pH7.2~7.8,pH<7.0,伴少精症,常反映输精管道阻塞、先天生精囊缺如或附睾病变;pH>7.8常见于急性前列腺炎;精囊炎或附睾炎。

完形填空

Do you        to write with your left hand? If you do, you are one of the millions of “lefties” in the world. Why do some people use left hand more often than others? To understand left-handedness, it is necessary to look at the         . The brain is divided into two hemispheres(半球). The left hemisphere is the center of language and logical thinking. This is where they do their math problems and memorize words. However, the         hemisphere controls how they understand ideas and         they respond(作出反应) to the five senses—sight, hearing,        , taste, and touch. The left hemisphere controls the right side of the body,          the right hemisphere controls the left side. Both sides of the body receive the          information from the brain because they are connected(联系). In right-handed people, the left hemisphere is stronger. In left-handed people, the right hemisphere is         .

Lefties prefer not only the left hand but also the left         . They would rather use the left foot to kick a ball because their whole body is “left-handed”.

From Newtown      Albert Einstein, Wen Jiabao to Obama, Choplin to Zhao Benshan, many    people are left-handed. Are you left-handed even though you are forced to write with your right hand? Don’t worry if you are, you are in good company.

小题1:A. enjoy           B. prefer           C. want

小题2:A. Body                B. hands             C. brain

小题3:A. right              B. left               C. middle

小题4:A. how               B. what             C. why

小题5:A. action               B. thinking         C. smell

小题6:A. although        B. while                C. or

小题7:A. same           B. different           C. difficult

小题8:A. weaker                B. bigger             C. stronger

小题9:A. head           B. ear               C. foot

小题10:A. interesting        B. famous              C. honest

多项选择题