According to the third paragraph,what will happen when the underground heat does not dis—appear? Coal heats up on its Own and catches fire and burns. 。 The underground oxygen will be used up.。 Poisonous fumes and greenhouse gases wm be accumulated anderground. 。 There will be an increase of abandoned mines. 。
请在第__65__处填上正确答案。 performed。 studied。 brought。 taken。
请在第__64__处填上正确答案。 unthinkable。 Impossible。 reasonable。 unimaginable。
According to the passage, it may soon be possible__________ to make something as good as human skin。 to produce drugs without side effects。 to transplant human organs。 to make artificial hearts and eyes。
John is eligible for this job. accepted 。 recommended 。 rejected 。 recommend。
请在第__61__处填上正确答案。