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牙膏皮属于 ( )。

A. 首要包装
B. 次要包装
C. 装运包装首要包装
D. 间接包装

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[音频]Mrs. John B. Dodd of Washington first proposed the idea of a "father's day" in 1909. Mrs. Dodd wanted (1)to honor her father, William Smart, who remained single after his wife died. Mr. Smart was left to raise (2) children all by himself. Mrs. Dodd wanted Father's Day to be celebrated on the first Sunday in June, her father's (3) . But it wasn't until 1966 that President Lyndon Johnson declared the third Sunday of June Father's Day. In 1972, President Richard Nixon established a national observance of Father's Day to be (4)on the third Sunday of June, coming almost sixty years (5)Mother's Day had been established. Today, Father's Day has become a day to not only honor our fathers, but all men who act as father-like figures.

在绘制《雪域雄鹰》时,背景远山云雾,烘托画面气氛。

A. 对
B. 错

在绘制《雪域雄鹰》时,雄鹰的构图要体现雄鹰的昂首挺胸、抬头远望。

A. 对
B. 错

表达式a=1,b=2,c=3的值为

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