如图,一圆内切四边形ABCD,且BC=10,AD=7,则四边形的周长为( )
“试管婴儿”是目前应州最广的生殖辅助技术,这种技术的特点是____ 生殖____ 受精____ 发育。
根据句意及首字母提示完成单词
① I usually go to school at h____ past seven.
② How many l____ do you have on Monday?
③ Class is over. Let's have a b____.
④ Her sister's favourite s____ is art.
⑤ I like listening to music. What a____ you?
正方形OABC的边长为4,对角线相交于点P,抛物线L经过O、P、A三点,点E是正方形内的抛物线上的动点.