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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】New Technique Promises Earlier Cancer Detection A new technique could revolutionize the early detection of cancer, giving sufferers a greater chance of beating the disease, American scientists said. R...
A.
before
B.
after
C.
although
D.
near
【多选题】根据我国《合同法》的规定,在( )情形下,要约失效。
A.
拒绝邀约的通知到达要约人。
B.
要约人依法撤销要约。
C.
承诺期限届满，受要约人未作出承诺。
D.
受要约人对要约的内容作出实质性变更
E.
要约人依法撤回要约