If attacked, black bears can______.A．run away slowlyB．turn to white bears for helpC．jump i

A （n) _____ is a chemical or electro－chemical attack on the metal surface which may be further increased if the sea－water is polluted.

The snakes will attack only if you take it ______ surprise.A．inB．byC．withD．on

You can improve your reading speed if you __________.

In the north part of black bears range, most of them are______.A．grey and whiteB．red and b

During the winter sleep, black bears always______.A．sleep like other woodland animalsB．kee

Circus lions, although they have been tamed, can______attack their trainer.A．reluctantlyB．