阅读理解。
It is August. It is very hot. A young man comes to a forest (森林). He's walking near the forest. On the
left there is a river and on his right there is a forest. He comes up to the river and wants to swim in it. At that
time he sees a tiger looking at him from the trees. It's going to jump on him soon.
"What can I do?" the young man is afraid and thinks hard. He knows a tiger runs very fast. What he can
only do is to jump into the river! But there is a very big crocodile (鳄鱼) in it. Its mouth is open and is waiting
for him there. He's standing there and doesn't know what to do. The tiger jumps over him. And soon the
young man sees that the tiger is in the mouth of the crocodile!
1. The weather is ______. [ ]
A. hot
B. rainy
C. cloudy
2. The young man want to ______. [ ]
A. look for the crocodile
B. play with the tiger
C. swim in the river
3. ______ wants to eat him. [ ]
A. Both the tiger and crocodile
B. The tiger
C. The crocodile
4. What does the young man do? [ ]
A. He runs away from the tiger
B. He jumps into the river.
C. He just stands there and does nothing
5. What happens (发生) at last? [ ]
A. The crocodile is in the mouth of the tiger.
B. The young man is in the mouth of the crocodile.
C. The tiger is in the mouth of the crocodile.
缺失，余留牙正常，可摘局部义齿修复，基牙
，采用弯制卡环
为孤立基牙，采用何种卡环效果最佳（）