16．An agriculture expert in West Africa once wrote about methods of how to kill mice without a lot of money．These methods are used by some local farmers．This expert in Mali said his gardener set four traps（陷阱）with this method-and caught one hundred and fifty （55）B in just one night．
The trap is easy to make．You need a plastic bucket （桶） that is empty and uncovered．Dig a hole in the ground and place the bucket inside．The top should be the same level with the （56）A of the ground．Fill the bucket with water to within eight centimeters of the top．Add small pieces of food wastes．These food wastes should float （漂浮） （57）C．Also put some wastes on the ground near the trap．
During the night，mice will come out to （58）Bfood wastes．They will fall into the trap．
If you don't have enough food to float，you can try another way．Put two pieces of cloth over the top of the bucket or the hole in the ground．I-cave a small opening where the pieces of cloth meet
Put a little food wastes on the cloth．When mice walk onto the cloth to eat，they will slide through opening into the water．
At one time or another，most farmers have problems with mice．Mice cat a lot of rice．They also carry diseases．People get （59）Cfrom eating or touching the rice that mice have got into．
There are other ways that farmers can（60）A these problems．One way is to use buildings specially designed to keep mice out．Another way is to use poisons （毒藥） to kill the mice．However，both of these methods can be costly．
Farmers must buy die materials to build the buildings．Or they must buy chemical poisons to Jail the mice．But these poisons can also be（61）Bto other living things-including the farmers who use them．
| 55．A．cats | B．mice | C．dogs | D．chickens |
| 56．A．surface | B．cover | C．part | D．halfway |
| 57．A．on the trap | B．on the top | C．on the water | D．on the ground |
| 58．A．drink | B．eat | C．make | D．hide |
| 59．A．a(chǎn) fever | B．a(chǎn) cold | C．sick | D．a(chǎn) headache |
| 60．A．deal with | B．get on | C．take care | D．cut down |
| 61．A．various | B．dangerous | C．nervous | D．precious． |
