【单选题】【消耗次数：1】
航天是指载人或不载人的航天器在地球（）的航行活动。
①
A.高空
②
B.大气层内
③
C.宇宙
④
D.大气层外
参考答案：
复制
纠错
相关题目
【多选题】
逆温是空气温度随高度增加而增高的大气垂直层结现象，逆温层是指出现逆温现象的极其稳定的大气层。逆温可分为（）等
①
A锋面逆温
②
B辐射逆温
③
C平流逆温
④
D下沉逆温
随机题目
【单选题】
We wont know whether it will be successful. We wont know whether there will be good ___.
①
ends
②
results
③
effects
④
causes
【单选题】
It has always been the ___ of our firm to encourage workers to take part in social activities.
①
plan
②
campaign
③
procedure
④
policy
【单选题】
He has left his book here on___, so that you can read it.
①
purpose
②
intention
③
aim
④
meaning
【单选题】
If I ___ it, I would do it in a different way.
①
were to do
②
do
③
had done
④
was to do
【单选题】
If he ___ he ___ that food.
①
was warned; would not take
②
had been warned; would not have taken
③
would be warned; had not taken
④
would have been warned; had not taken
【单选题】
Information has been put forward ___ more middle school graduates will be admitted into universities.
①
while
②
that
③
when
④
as
【单选题】
The order came ___ the soldiers ___ the small village the next morning.
①
that; had to leave
②
that; should leave
③
/; must leave
④
when; should leave
【单选题】
The question came up at the meeting ___ we had enough money for our research.
①
that
②
which
③
whether
④
if
【判断题】
I have waited for two weeks impatiently and finally the order was cancelled.
①
正确
②
错误