A.\(i = 1,2\cos \left( {100\pi t + \dfrac{\pi }{3}} \right)\left( A \right).\)
B.\(i = 1,2\cos \left( {100\pi t - \dfrac{\pi }{3}} \right)\left( A \right).\)
C.\(i = 12\cos \left( {100\pi t - \dfrac{{2\pi }}{3}} \right)\left( A \right).\)
D.\(i = 12\cos \left( {100\pi t + \dfrac{\pi }{3}} \right)\left( A \right).\)

A.\(A = \left| {{A_1} - {A_2}} \right|.\)
B.\(A \le {A_1} + {A_2}.\)
C.\(\left| {{A_1} - {A_2}} \right| \le A \le {A_1} + {A_2}.\)
D.\(A \ge \left| {{A_1} - {A_2}} \right|.\)

A.rest on his laurels
B.put himself in other people's shoes
C.eat humble pie
D.call it a day

A.creating impacts on
B.doing harm to
C.causing trouble for
D.making bad decisions on

A.generous
B.countless
C.overwhelming
D.widespread

A.enhance communication
B.widen the gap
C.meet the requirements
D.gain confidence

A.took off
B.filled in
C.stood up
D.turned down

A.marry
B.marriage
C.marrying
D.married

A.lovely big Japanese
B.big Japanese lovely
C.Japanese big lovely
D.lovely Japanese big

A.Being spent a lot of time
B.Spent a lot of time
C.Having spent a lot of time
D.To spend a lot of time