在平直公路上行驶的a车和b车，其位移﹣﹣时间图象分别为图中直线a和曲线b，已知b车的加速度恒定且a=﹣2m/s²，t=3s时，直线a和曲线b刚好相切，下列说法正确的是（   ）

按要求转换句子,每空一词。
____ It's windy in Beijing. (对划线部分提问)  
______  ______ the weather in Beijing?
____ Mary is talking on the phone.(改为否定句)
Mary _______  _________ on the phone.
____ We're cleaning the playground. （改为一般问句 ）
______  _______ cleaning the playground?
____ My parents are talking with Mr.Green.   (改为一般问句 )
_________ ________ parents _______ with Mr.Green ?
____ A koala comes from Australia. (变否定句)
A koala ________  ________ from Australia.
____ He likes dolphins very much.   (变一般疑问句)
________ he _________ dolphins very much?
____ I like Tom because he is very friendly.  (对划线部分提问)
_________ do ________ like Tom?
____ Pandas are from China.   (同义句转换) 
Pandas _______  ________ China.
____ She likes dumplings, fish and apple juice.(改为否定句)
She ________like dumplings, fish ______ apple juice.
____ She'd like beef and onion noodles for lunch. (就划线部分提问)
_______   _____  _______ noodles ______ she like for lunch?