They stand ______.A．under the sunB．in the sunC．over the sunD．against the sun

The second engineer seemed to know what the sign ______.A.stand byB.stand forC.stood byD.s

The purpose of engine stand-by is that ____.A.the main engine in the stand-by conditionB.a

Nowadays teenagers are not______to stand and appreciate works of art; they prefer to parti

Men are under greater pressure than women in that they______.A．are not allowed to make mis

The word "carbon" stands for______.A．intelligent robotsB．a chemical elementC．an organic su

The selection says that trends are toward the______.A．growth of cities and shrinking of su