第二节：短文改错(共10小题；每小题1.5分，满分15分)

注意：原行没有错的不要改。

A helicopter is sometime more useful than a big plane. When　      11＿＿＿＿＿＿

it takes off, it goes straight on. When it lands, it comes             12____________

straight down. It needs not only a small place for both taking        13 ___________

off and landing. When a tall building is on fire, we can             14____________

see a helicopter to come down to rescue the people on the top        15 ___________

of them. Helicopters make many kinds of work easy. They are        16____________

used to making maps, flying over the ground and taking pictures     17____________

from the air. To rescue people whom are very                     18____________

sick or in danger, helicopters are send to some faraway            19____________

areas. The helicopter takes place of a car or a train                20____________

in some areas.