A£®falls several times©úB£®slows from 350 to 120 beats a minute©ú
C£®goes up from 3 or 4 to 350 beats a minute©úD£®reduces from its normal 350to 3or 4 beats a minute©ú
2£®During the winter sleep£¬hibernating animals can lose©ú____ of their body weight£®
A£®1£¯2©úB£®1£¯3©ú C£®2£¯3©ú©úD£®1£¯4©ú
3£®What effect does the substance HIT have on hibernating animals£¿©ú
A£®It has a chemical effect on them£®©úB£®It has a bad effect on them£®©ú
C£®It has an effect on the rising of their body temperature£®©ú
D£®It can control the periods of their waking and sleeping£®©ú
4£®Doctors believe that HIT might be used during operations because©ú____ £®©ú
A£®it could make the patient sleep©ú
B£®it could reduce the body\'s temperature and heartbeats to reduce bleeding©ú
C£®it could make the sick feel less pain D£®it could keep the sick awake during the operation©ú
5£®HIT might be used in space travel ____ £®
A£®to make the travel faster©úB£®to make the astronaut hibernate for most of the trip
C£®to save fuel£¨È¼ÁÏ£©©úD£®to make the spaceship come back on time
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