A.isn’t
B.wasn’t
C.doesn’t
D.hasn’t
第1题:
A、doubt whether
B、doubtful
C、doubt it
D、doubtful whether
第2题:
He’s watching TV? He’s ________ to be cleaning his room.
A) known B) supposed C) regarded D) considered
第3题:
第4题:
Ada: How's the young man?
Bill:______
A、He's twenty.
B、He's a doctor.
C、He's much better.
D、He's Dick.
第5题:
You are signing on a deck officer,who will be designated as one of the GMDSS operators,before sailing foreign.Which statement is TRUE ________.
A.He/she must have an STCW certificate endorsed as“Valid for Service on Vessels Operating in the GMDSS System”
B.He/she must present either an FCC-issued license or a Coast Guard-issued license
C.You must consult the“List of Qualifications”on the reverse of his/her FCC-issued license
D.His/her Merchant Mariners Document must have an added endorsement as “Radio Electronics Officer”
第6题:
下列原子或离子的核外电子从基态激发到2s或2p轨道,所需能量相同的是 ? ①H , ②He , ③He+, ④Li2+