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【单选题】
我国酸雨中关键性离子组分的是A.
NO3- 、 SO42-
B.
SO42- 、Cl-
C.
SO42- 、 NH4+
D.
SO42- 、 Na+
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反馈参考答案：
举一反三
【单选题】What thing DIDN'T the man do?
A.
He checked the flight schedule.
B.
He reserved a ticket.
C.
He told his sister about his visiting.
D.
He flew to San Francisco.
【单选题】What thing did NOT the man do?
A.
He checked the flight schedule.
B.
He reserved a ticket.
C.
He told his sister about his visiting.
D.
He flew to San Francisco.
【单选题】He ______________ two tickets for us before he arrived at the entrance of the cinema.
A.
had reserved
B.
has reserved
C.
was reserving
D.
has been reserving
【单选题】患者男，因病毒感染导致发热，患者主诉发冷、疲乏无力T38．5°C。此时的特点为
A.
产热与散热平衡
B.
产热大于散热
C.
产热小于散热
D.
体温在较高水平上趋于平衡
E.
产热、散热不平衡
【单选题】He gave me a book of the sort usually reserved for naughty schoolchildren.
A.
provided
B.
prepared
C.
appointed
D.
kept
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