题干

森林失火时,灭火队员通常要砍伐一些树木,开辟”防火隔离带”,其主要目的是(   )

A:隔离空气

B:隔离可燃物

C:降低可燃物温度

D:开辟运输水的道路

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答案(点此获取答案解析)

B

同类题4

阅读短文及文后A-E选项,选出可以填入各题空白处的最佳选项。

Jellyfish and Crocodiles(水母和鳄鱼)

    Hi, my name's Ben. My family, that's Mum, Dad and me, live in Broome in Western Australia. Western Australia is about 80 times larger than Italy, but only 1.5 million people live there. ____ It has a population of about 12,000. It’s right on the coast and is known for its famous Cable Beach, which is 20km long.

    We live in the town in a house with a large garden. ____ We drive to Cable Beach and look for a quiet place to swim or to fish. We don't go swimming from October to March because there may be box jellyfish in the water. The box jellyfish is one of the most dangerous jellyfish. ____ If you are attacked by one, the best thing to do is to pour vinegar(醋)over the area of your body where you are hurt. That's why we always take a bottle of vinegar with us.

     ____ A year ago I went camping in the bush with my friend Bill and his dad. We wanted to do some fishing and set up camp about 20 metres from a river. ____ Bill's father told us to get up and we quickly got out of the tent and ran to the car, which was only 10 metres away.

    Bill's dad started the car and turned on the head

A.lights. In the light, we could see a big crocodile pulling the tent into the river!

B.In Australia, they kill up to 65 people a year.

C.Broome is a town in the north of Western Australia.

D.Another dangerous animal in Western Australia is the saltwater crocodile.

E.At weekends I often go fishing or swimming with my friends or my parents.

F.Suddenly, at 3 o’clock in the morning, we felt something pulling on our tent.