______ we need air and water, so we need criticism and self－criticism.A．Even thoughB．So lo

.Water and air are _______ to human beings. We can

Food packages, bottles and tins for drinks can cause ______.A．air and water pollutionB．bot

Some grasses and flowers can survive in the desert because ______.A．the need little water

We need ________ communication skills: listen carefully, think before you speak and ma

We can t emphasize ______ the importance of air and water for the survival of all species.

We dont need air conditioning, ______.A．nor can we afford itB．neither can afford itC．nor w