We know that trees are useful in our everyday life. They give us 1 things, such as wood, oxygen, rubber(橡胶), medicines 2 many other things. They can also tell us a lot about our climate. The following are the reasons. If you cut 348 a tree, you can see that it has many rings. Most trees grow one new ring 4 year. Because of this, we know how old a tree is. A tree over a hundred 5 means that it has more than a hundred 6 . When the climate is dry or very cold, the trees do not grow very much and their rings 7 usually thin. When it is wet and warm, the rings
8 thicker. If the rings are suddenly very thin or suddenly very thick, it means that the 9 changed suddenly. If we look at the rings on the tree, we can learn about the climate in the past years. We can see
10 changing today.
1.A.much B.lot C.many
2.A.so B.and C.while
3.A.down B.cross C.into
4.A.every B.many C.some
5.A.year old B.old C.years old
6.A.plants B.rings C.leaves
7..A.is B.are C.were
8.A.are much B.are more C.is much
9.A.day B.year C.climate
10.A.how our climate is B.how is our climate C.how to our climate
—How long have you been like this?
— .
A.Last month B.Two months ago C.Since last month
Mr. Smith didn’t tell us .
A.where does he live B.where he lived C.where did he live
Miss Wang told us that the moon around the earth.
A.moves B.moved C.had moved
He to school by bike, but now he to school on foot.
A.used to going; gets used to go
B.used to go; gets used to go
C.used to go; gets used to going
mum asked me to close the windows before going to bed, I forgot to do so.
A.Though; but B.Though; / C.Until; them