Stress and______are symptoms of life in modern society.A．leisureB．anxietyC．nervousnessD．em

The usual symptoms of cavitation in a centrifugal pump is _____.A.noise and vibrationB.an

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

The clear[l]and dark[l]are the______of the phoneme ／l／.A．phonesB．allophonesC．phonemesD．mor

______ are afraid of difficulties, and we are all determined.A．None of usB．Not all of usC．

Stress is a natural part of everyday life and there is no way you can avoid it, ______you

Most of the stones are____________ a man and weig