【C4】A．linkB．connectC．combineD．communicate

Researchers have established the（) between smoking and cancer.A linkB chainC joinD econo

Operating systems provide （） between users and the computer.A.a linkB.an interfaceC.devic

The new bridge will ______ the island to the mainland.A．linkB．uniteC．joinD．combine

The Committee regrets that it cannot right now______your group to their Society.A．linkB．af

【C4】A．leadB．connectC．collectD．communicate

_________(56)A.lead B.connectC.collect D.communic