春节时，14岁的甲用自己的压岁钱在某商场购买了价值2000多元的电

【名词&注释】

骨骼肌(skeletal muscle)、肌钙蛋白(troponin)、肌细胞(cells)、肌浆网(sarcoplasmic reticulum)、婚姻家庭制度(marriage and family system)、阶级社会(class society)、法定代理人、压岁钱、电动玩具

[单选题]春节时，14岁的甲用自己的压岁钱在某商场购买了价值2000多元的电动玩具，则 （　　）

A. 甲的行为当然发生效力
B. 甲的行为经其法定代理人追认后方发生效力
C. 商场有权催告甲的法定代理人在合同期限内作出追认
D. 如果甲的法定代理人未在合理期限内作出拒绝追让的意思表示，则视为默认

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学习资料：

[单选题]Which of the following is the best title of the article?

根据以下内容，回答下面的题目。Researchers have found that REM (rapid eye movement) sleep is important to human beings．This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence．The deeper a person’s sleep becomes, the longer the periods of rapid eye movement．There are physical charges in the body to show that a person has changed from NREM (non-rapid eye movement) to REM sleep．Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly．Accompanying these physical changes in the body is a very important characteristic of REM sleep．It is during REM sleep that a person dreams．According to the passage, how often does REM sleep occur in one night?

A. REM Sleep
B. Two Types of Sleep
C. Sleepers
D. What Happens to Sleepers

[单选题]阶级社会形成以来的婚姻家庭制度是 （　　）

A. 群婚制
B. 一夫一妻制
C. 普那路亚婚制
D. 对偶婚制

[单选题]骨骼肌的兴奋一收缩耦联不包括 （　　）

A. 电兴奋通过横管系统传向肌细胞的深处
B. 三联管结构处的信息传递
C. 肌浆网中的Ca+释放入胞浆
D. Ca2+由胞浆向肌浆网的再聚积
E. 肌浆中的Ca+浓度迅速降低，导致肌钙蛋白和它所结合的Ca+解离

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