问题：
[单选] 迷走神经传出纤维的冲动可看作是（ ）
迷走神经传出纤维的冲动可看作是（ ）
问题：
[单选] ________the difficulties of exercising, many people prefer to be on a diet to lose weight．
________the difficulties of exercising, many people prefer to be on a diet to lose weight．
问题：
[单选] 回答题Never laugh at a snow covered mountain! Laughter and yelling, during the avalanche season,
回答{TSE}题Never laugh at a snow covered mountain! Laughter and yelling, during the avalanche season, can cause a deadly pile of snow．Huge snow slides are most common in mountains where there are stee
问题：
[单选,材料题] We can conclude from this passage that avalanches________
We can conclude from this passage that avalanches________
问题：
[单选,材料题] What job will be done the day before the festival begins?
What job will be done the day before the festival begins?
问题：
[单选,材料题] In this passage "unstable" means________
In this passage unstable means________
