The expression "scratch the surface" most probably means ______.A．think hard in a puzzled

If there are micro－seized areas on the liner or skirt scratch－over manually with a coarse carbo－rundum stone （grindstone), moving the grindstone ____ at an angle of 20 to 30 degrees to horizontal.

Which of the following best expresses the essential information in the highlighted sentenc

The conductor asks the boy to hop on the express train.（)

Parents in the Polar Express can hear the sound of the sleighbell, too.（)

Accuracy and expressiveness are the two______ in translation, the first is to express the

Which of the following best expresses the writer’