老年人不明原因肠梗阻，应首先考虑的疾病是（）。
A.蛔虫团所致的肠梗阻
B.粘连所致的肠梗阻
C.嵌顿性腹外疝
D.消化道肿瘤
E.小肠扭转
参考答案：D
Everything is so expensive now.It is hardly ___ to save money.
A．probable
B．likely
C．possible
D．feasible
用所给单词的适当形式填空。
1. My best friend is from __________ (Japanese).
2. This is the __________ (begin) of the garden tour.
3. The koalas often sleep during the day and eat __________ (leaf) at night.
4. Don't play football in the street. It's __________ (danger).
5. Are they __________ (friend) to you?
