Ⅰ.选词填空(有两词多余)
slippery，layer，issue，shortage，irreversible，extinct，crack，sandstorm， drought， landslide
1．The frozen snow was so slippery that it was hard to keep one's feet.
2．The branches are weighed down by a heavy layer of snow.
3．We saw several extinct volcanoes on our trip to Japan.
4．Researchers found an almost total crop failure and a severe shortage of drinking water.
5．This is a big issue: we need more time to think about it.
6．A sandstorm is a strong wind in a desert area, which carries sand through the air.
7．Millions of people are threatened with starvation as a result of drought and poor harvests.
8．The ice cracked as I stepped onto it.
