7.This is_____________ (require) reading.

The sudden rise in global unemployment is_____________ in the decade because of the COVID-19 pandemic. A: giant B: great C: unimaginable D: unparalleled

The invention of airplane is_____________ for our society.(飞机的发明对于我们的社会来说是具有革命性的。） A: revolution B: revolutionary C: revolutions D: revolutioned

Since<br/>the amount of land is fixed, the total supply of land<br/>is_____________ A: relatively<br/>elastic. B: perfectly<br/>elastic. C: perfectly<br/>inelastic. D: relatively<br/>inelastic.