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问题 问答题

如图表示了化合反应和氧化反应的关系．按示例填空：

A部分：是化合反应，不是氧化反应，例：二氧化碳+水→碳酸；

B部分：______，例：______；

C部分：______，例：______．

答案

根据化合反应的特点是“多变一”，氧化反应的特点是物质与氧的反应对相关的反应进行书写；

由题意B处：是氧化反应不是化合反应，如：酒精在空气中燃烧：酒精+氧气

点燃
水+二氧化碳等反应是氧化反应不是化合反应．

C：表示既属于化合反应，又属于氧化反应；如：红磷在空气中燃烧的反应：磷+氧气

点燃
五氧化二磷； 硫粉在空气中燃烧：硫+氧气
点燃
二氧化硫等即是氧化反应又是化合反应；

故答案为：B：是氧化反应不是化合反应；酒精+氧气

点燃
水+二氧化碳

C：是化合反应，又是氧化反应；磷+氧气

点燃
五氧化二磷

多项选择题

下列哪些属于脂溶性维生素

A．维生素A

B．维生素B

C．维生素C

D．维生素D

E．维生素E
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单项选择题

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.

20（）

A.subsequent

B.inadequate

C.sequential

D.frequent
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