选择正确的音节写下来。
霜(shuāng shāng) 朝(zāo zhāo) 蝶(dié déi) 紫(zhǐ zǐ)
shuāng zhāo dié zǐ
The police is offering a(n) _________ of $2000 to anyone who will provide information about the lost boy.
A.praise
B.prize
C.reward
D.award
增感屏结构中反射层的作用是()
A.提高发光效率
B.提高清晰度
C.改善颗粒度
D.控制量子斑点
E.提高对比度