61．Crushers and rollers are used to __________-

　　A．remove the sharp metal objects B．reduce items to small pieces

　　C．separate the light elements D．tear open the plastic bags

　　62．Among the problems big cities are facing, the basic one is that ________.

　　A．there are too many holes

　　B．there is a labor shortage

　　C．moving rubbish to faraway dumps is too costly

　　D．finding a new way for recycling is difficult

　　C

　　Every animal is a living radiator(散热器)－heat formed in its cells is given off through its skin. Warm-blooded animals maintain a steady temperature by constantly replacing lost surface heat; smaller animals, which have more skin for every ounce of body weight, must produce heat faster than bigger ones. Because smaller animals burn fuel faster, scientists say that they live faster.

　　The speed at which an animal lives is determined by measuring the rate at which it uses oxygen. A chicken, for example, uses one-half cubic centimeter of oxygen every hour for each gram it weighs. The tiny shrew uses four cubic centimeters of oxygen every hour for each gram it weighs. Because it uses oxygen eight times as fast, it is said that the mouselike shrew is living eight times as fast as the chicken. The smallest of the warm-blooded creatures, the hummingbird, lives a hundred times as fast as an elephant.

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