哪些字娃娃会拉手？连一连。
扌 俞 yú
木 苗 miáo
足 止 zhǐ
贝 长 zhàng
描 miáo 榆yú 趾zhǐ 帐zhàng
Wow! These flowers _____ very nice. Do you like them? [ ]
A. look
B. looks
C. to look
D. looked
12岁儿童由饮水含氟量0.3ppm地区迁居饮水含氟量1.2ppm地区，氟牙症发生的可能性为
A．0
B．25%
C．50%
D．75%
E．100%
