第15练阅读+七选五+语法填空+短文改错Ⅰ
阅读理解A体裁:记叙文话题:动物世界词数:330时间:7′Tropicalfishhobbyistswilltellyoutheirtanksareasourceofrelaxation,butrecentresearchsuggeststhefishmightdisagree
ManyAmericanhouseholdscontainafishtank,whoseaveragesizeislessthan10gallons
Yetastudycomparingthebehaviorofcommonfreshwaterfishfoundthatthosekeptinsuchsmalltanksweremoreaggressivethanthoseinlargeronesandweremorelikelytofight
“Ifpeoplekeptdogsintheseconditions,they'dbeputinprison”,saidtheauthor,RonaldOldfield
“Inlargertanks,thefishwerenotincontinuouseyesightofeachother
Theywereswimmingaround,checkingeverythingoutratherthanbeatingeachother”,headded
“It'ssomethingweshouldthinkabout
”Thestudyconsistedoftwoexperiments
Inone,Dr
Oldfieldtestedtheeffectsofovercrowdingbykeepingtanksizeconstant(不变)whileincreasingthenumberoffish