（180×49+20）÷50%，
=（80+20）÷0.5，
=100÷0.5，
=200．
答：这个数是200．
句型转化。
1. Nobody came to the yard sale because the weather was so bad. (就画线部分提问)
_____ _____ nobody_____ to the yard sale?
2. brother, to, museum, go, did, the, your, month, last(?) (连词成句)
__________________________________________
3. Grace bought a souvenir. (就画线部分提问)
_____ ______ Grace_____?
4. What else did you do? (改为同义句)
_____ _____ _____did you do?
MRI表现为短T1和短T1信号影，信号强度不均匀的是（）
A.巧克力囊肿
B.卵巢浆液性囊腺瘤
C.卵巢黏液性囊腺瘤
D.卵巢癌
E.卵巢转移瘤
