1.Which of the following staetments is true about chemical nutrients in an ecosystem? a.They flow through the system,losing some nutrients in the process. b.They cycle within the ecosystem,being constantly reused. c.They can be converted into energy. d.They depend on sunlight as their source. e.They cannot be obtained from decomposition. Ans:b b我能接受但一開始是寫d... 可是又遇見了第二題...有矛盾? 2.The chemical energy used by (most) organisms for metabolism and growth ultimately comes from ______. a.heat b.the decomposition of plants c.the sun d.carbon dioxide e.evolution Ans:c 和第一題有矛盾? 所以我寫了a... 3.Scientists discard a model when ______. a.new experimental results are obtained that cannot be explained by the old model b.the old model has been in place a long (舊的被長時間取代就丟棄 好像對..) c.the individuals who first developed the old model have died (新個體被發展出來 舊的死亡 是這個意思嗎?) d.no experiments related to the model have been done recently (沒有實驗再與此model有關聯 所以捨棄 好像也對...) e.all of the above Ans:a 每個選項看起來都正確@@ 我選e... 4.In some places a polypeptide may coil or fold back on itself.This is call _____,and the coils or folds are held in place by ____. a.tertiary stucture...covelent bonds b.secondary structure...hydrogen bonds Ans:b a.b配對都沒問題 套進去看來也都合理... --

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