现行棉花国家标准规定，五级锯齿白棉，长度29毫米，马克隆值为C级，其质量标识为（）。

（6分）已知一次函数y=kx+b的图像经过点（1，1），（-2，-5）.

（1）求此函数的解析式。

（2）若点（a，3）在此函数的图像上，求a的值为多少？

采用年数总和法计提折旧时，年折旧率为逐年递减的分数，其分子为该项固定资产 ______。

A．预计使用年数

B．年初时尚可使用的年数

C．已使用的年数

D．预计净残值

男性，52岁，1周来出现阵发性夜间心前区闷胀，伴出汗，每次持续约10min，能自行缓解；白天可正常工作。1h前在熟睡中再发心前区胀痛，明显压抑感，自服速效救心丸无效，症状持续不缓解而来院。既往体健，无类似发作。入院查心电图呈心前区导联ST段抬高。该患者最可能的诊断是

A．初发性心绞痛．
B．劳力性心绞痛
C．恶化型心绞痛
D．变异型心绞痛
E．梗死后心绞痛

下列哪项是美国学者T.B史密斯的政策执行过程模型中引起政策失效的因素（）

A.决策者的价值观

B.立法机构

C.标准化管理

D.偶然失效

E.理想化的政策

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.

3（）

A.personal

B.unique

C.private

D.single