高度近视可以献血吗？

二次函数y=ax²与直线y=2x﹣1的图象交于点P（1，m）．

（1）则a、m的值分别为 _________ 、 _________ ；

（2）二次函数的表达式为 _________ ，并指出x _________ 时，该表达式的y随x的增大而增大．

C)用所给单词的适当形式填空。(5分)

1．Help       (you)to some soup，boys and girls．

2．Thanks for       (keep)the secret for me．

3．Where will you choose       (sit)on the bus?

4．Is Tian’anmen Square       (big)city square in the world?

5．Kitty’s teacher invited me       (join)in their school trip to the World Park．

供水管道冲洗消毒应注意（）事项。

A.管道在冲洗工程中，由于水量变化较大，应用通信设备随时与现场保持联系，了解管道冲洗情况，以便于及时加泵和减泵

B.冲洗过程中应安排专人对冲洗管道进行巡视，检查是否存在有阀门未开启或关闭，排气阀、排水阀、管道等设施右无漏水的情况

C.第一次冲洗完毕后应尽量将管道中的水排净，为下次灌水浸泡作准备；同时应将撤除的阀门及时恢复，打开排水口，以免造成第二次污染

D.无论是第一冲洗或是第二次冲洗，每次都要对冲洗时间、水量、水质及冲洗效果有文字记录和影像资料

E.管网冲洗完毕，能否投入使用，以水质中心的检测报告为准

假如你有幸成为一位2011年深圳大运会的志愿者，你认为在服务过程中应当（）。

①维护国家安全、荣誉和利益

②遵守宪法和法律、维护社会稳定

③直接管理有关国家事务

④增强民族自豪感、自尊心和自信心

A.①②③

B.②③④

C.①③④

D.①②④

Young girls at high risk for depression appear to have a malfunctioning reward system in their brains, a new study suggests. The finding comes from research that (1) a high-risk group of 13 girls, aged 10 to 14, who were not depressed but had mothers who (2) recurrent depression and a low-risk group of 13 girls with no (3) or family history of depression. Both groups were given MRI brain (4) while completing a task that could (5) either reward or punishment.

(6) with girls in the low-risk group, those in the high-risk group had (7) neural responses during both anticipation and receipt of the reward. (8) , the high-risk girls showed no (9) in an area of the brain called the dorsal anterior cingulated cortex (背侧前扣带皮质), believed to play a role in (10) past experiences to assist learning.

The high-risk girls did have greater activation of this brain area (11) receiving punishment, compared with the other girls. The researchers said that this suggests that high-risk girls have easier time (12) information about loss and punishment than information about reward and pleasure.

"Considered together with reduced activation in the striatal (纹状体的) areas commonly observed (13) reward, it seems that the reward-processing system is critically (14) in daughters who are at elevated risk for depression, (15) they have not yet experienced a depressive (16) ," wrote Ian H. Gotlib, of Stanford University, and his colleagues. " (17) , longitudinal studies are needed to determine whether the anomalous activations (18) in this study during the processing of (19) and losses are associated with the (20) onset of depression," they concluded. The study was published in the April of the Archives of General Psychiatry.

13（）

A.after

B.among

C.with

D.during