下列划线字读音无误的一项是( )
A:溃退(guì) 舀水(yǎo) 白洋淀(dìng)
B:绥靖(suǐ) 脂粉(zhī) 蹿一蹿(cuàn)
C:寒噤(jīn) 拂晓(fú) 颤巍巍(chàn)
D:提防(tī) 惊骇(hài) 迫击炮(pò)
给加下划线字选择正确的解释。
题西林壁 ( )
预防夜盲症的最佳食物是( )
我是小法官。
Mike and John: Happy birthday to you, Sarah!
Sarah: Thank you.
Mike and John: How old are you?
Sarah: I'm ten.
Mike and John: These are for you. A cake and two kites!
Sarah: Thank you. Let's eat the cake.
Mike and John: Great!
阅读对话,判断对错。
一个弹簧挂30N的重物时,弹簧伸长1.2cm,若改挂100N的重物时,弹簧的总长度为20cm,则弹簧的原长为 ( )