问题
单项选择题 A1型题
脑组织中灰质血流量与白质血流量的关系（）
A.白质血流量是灰质血流量的2倍
B.灰质血流量是白质血流量的2倍
C.白质血流量是灰质血流量的3～4倍
D.灰质血流量是白质血流量的3～4倍
E.白质血流量是灰质血流量的1倍
答案
参考答案：D
解析：脑组织中灰质血流量是白质血流量的3～4倍。
搜题请搜索小程序“爱下问搜题”
脑组织中灰质血流量与白质血流量的关系（）
A.白质血流量是灰质血流量的2倍
B.灰质血流量是白质血流量的2倍
C.白质血流量是灰质血流量的3～4倍
D.灰质血流量是白质血流量的3～4倍
E.白质血流量是灰质血流量的1倍
参考答案：D
解析：脑组织中灰质血流量是白质血流量的3～4倍。
| 完形填空。 Let's have a look at American students' school life. On school days, American students usually __1__ up at 7:00 am. Most students walk or __2__ a yellow school bus to school. Very __3__ students ride bikes. __4__ they arrive at school at about 8:30 am, they meet their friends and __5__ about their activities. They put their backpack (背包) in a small cupboard (衣柜) and take out only one book, some writing paper and a pencil __6__ each class. In the middle school, they learn many subjects. At __7__ , the students eat lunch at school. They usually have meat, vegetables, fruit and some drinks. __8__, some students prefer pizza, hot dogs or hamburgers. After __9__, they continue(继续) to have classes until 3:00 pm and then they go back _10__ . | ||||
|