几道有疑问的高中英语选择题

几道有疑问的高中英语选择题
1.The coast line extends about 2000 kilometers______.
A.from east to west B.from the east to west
C.from the east to the west D.from the eastern to the western
,是固定搭配吗?）
2.All the ______are interested in the_______.
A.present students;present situation
B.student present;situation present
C.students present;prensent situation
D.present students ;situation prensent
(答案是C,弄不懂）
3.---Have you visited the Children's Palace?
---No,how I wish I______.
A.did B.have C.were D.had
(答案是A)
4.It's really cold today.What's the______?
A.room'temperature B.room teperature
C.temperature of room D.temperature of room's
(答案是B)
5.The plane crashed in the mid-air____no one came out alive.
A.and so that B.and therefore C.but D.because
,B 为什么不行?
6.---This returned scholar has become one of the top experts in this filed.
-----Yes.I know him very well.He_____in Africa with wild animals for eight years.
A.has worked B.had worked C.worked D.has benn working
(答案是c,为什么不是b?)