【C4】A．harmfulB．disastrousC．harmlessD．poisonous

Can you tell the difference between（) mushrooms and edible（可食用) varieties？A poisonous

Bracken, a poisonous weed, is spreading and damaging much pastureland in the Northern Hemi

【C14】A．harmfulB．harmlessC．attackedD．deleted

One of the most damaging plant parasites is the stem eelworm.A．harmfulB．elegantC．versatile

【C5】A．detrimentalB．disastrousC．destructiveD．demeaning

Unwise decisions will lead to _________ results.A、unexpectiveB、disastrousC、desiredD、unre