阅读理解：Whatmakesredtides(赤潮)happen?Redtidesonlyhappenwhenconditionsintheseaareright．Inthepastfewyearsfactoriesandpeoplehavebeenputtingmorechemicals(化学物品)into

Question

阅读理解：

What makes red tides(赤潮)happen?Red tides only happen when conditions in the sea are right．In the past few years factories and people have been putting more chemicals(化学物品)into the sea．These chemicals help algae and protozoa to grow very quickly．The temperature of the sea is also important．Red tides usually happen at 20 to 30 degrees Celsius(摄氏度)．If the water’s temperature goes up to two degrees in a week scientists may tell fishermen to get ready for a red tide．Red tides often happen in dry warm areas where there is little wind．Living things grow easily in these places．Sometimes fishermen help red tides by mistake．They put small sea animals into the water for food to help fish grow．When they put too many in and don’t clean up what is left those animals can make the water dirty．That helps the living things to grow better．

(1)

Why did red tides happen in the past few years?
[　　]
A．	We don’t know the reason
B．	People put more chemicals into the sea
C．	The temperature does up too high
D．	They are dry warm areas

(2)

Which is the most important to cause red tides?
[　　]
A．	The areas are dry and warm
B．	The temperature
C．	There are many living things in the sea
D．	The fishermen got too much fish

(3)

What do the fishermen do with red tides?
[　　]
A．	They got too much fish
B．	They put small sea animals into the water for food to help fish grow
C．	They put everything into the sea
D．	They pour waste water into the sea

(4)

What makes red tides happen?
[　　]
A．	They put everything into the sea
B．	They put too many in and don’t clean up what is left
C．	The areas are too dry and warm
D．	The color of the sea changes a lot

(5)

What should we do in the future?
[　　]
A．	We can often put small sea animals into the water for food
B．	We should protect sea
C．	We should do our best to change the color of sea
D．	We may do everything as usual

Answer 1

答案：1．B;2．B;3．B;4．B;5．B;