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【单选题】
涉密地理信息的保密期限为“长期”。以下标注正确的是()。A.
保密长期
B.
密级★长期
C.
长期保密
D.
长期★密级
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【单选题】He actually didn't see the man ______ the room, but he heard them ______ in it.
A.
to enter, laugh
B.
enter, to laugh
C.
to enter, laughing
D.
enter, laughing
【单选题】下列关于碳酸盐热稳定性顺序正确的是 。
A.
铵盐 > 过渡金属盐 > 碱土金属盐 > 碱金属盐
B.
碱金属盐 > 碱土金属盐 > 过渡金属盐 > 铵盐
C.
碱土金属盐 > 碱金属盐 > 铵盐 > 过渡金属盐
D.
过渡金属盐 > 碱土金属盐 > 碱金属盐 > 铵盐
【单选题】He made ________ known to his friends that he didn’t want to enter politics.
A.
that
B.
it
C.
himself
D.
him
【简答题】A．She was afraid of the professor. B．She didn't enter her house. C．She didn't make full preparations for her lessons. D．She lost her key.
【单选题】Dayu didn’t enter his home for three times because ______.
A.
He didn’t like to go home
B.
He was not allowed to go home
C.
He was busy and had no time to go home.
D.
He was asked not to do so.
【单选题】–Hi, Kate! --Hi, Mary. I ______ you are here.
A.
don’t know
B.
don’t think C, think D. didn’t know
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