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【单选题】
He ___________ a generous donation to the charity.A.
made
B.
took
C.
won
D.
did
E.
got
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举一反三
【单选题】测量二氧化碳分子量时,称量(瓶 + 气体)总质量时,每次 选择同一台天平称量,称量时 用手直接拿锥形瓶进行称量。
A.
必须，不能
B.
不必，能
C.
不必，不能
D.
必须，能
【单选题】________in Paris for five years, but still can't read and write in French. [ ]
A.
Having lived
B.
Having been living
C.
He has lived
D.
Although he has lived
【单选题】I ______ for the bus for the past 20 minutes and still it has not come.
A.
wait
B.
waited
C.
have waited
D.
have been waiting
【简答题】A．Drags have caused American people to have no enough drags of medical use. B．Drugs have mined many American people's mind. C．Drags have caused many American people to lose health. D．Both B and C.
【单选题】Google is still recognized as the best general web search engine. Recognizing this, we have decided to offer a 'Googling to the Max' course in which we teach how to use Google really well, taking adva...
A.
bigger than any other search engine database in the world
B.
limited by the database
C.
used to be a 'Googling to the Max' course
D.
used to search fuzzy things
【单选题】有关月经生理的叙述,错误的是
A.
月经第一次来潮称初潮
B.
经血的成分全是血液
C.
经血呈暗红色,不凝固
D.
月经期一般无特殊症状
E.
初潮年龄一般为13~14岁
【单选题】有关月经生理的叙述,错误的是
A.
月经第一次来潮称初潮
B.
经血的成分全是血液
C.
经血呈暗红色，不凝固
D.
月经期一般无特殊症状
E.
初潮年龄一般为1３～15岁
【多选题】测量二氧化碳相对分子量时,需要多次称量,下列说法正确的是
A.
称量（瓶 + 水）质量时应该使用电子分析天平
B.
应该先称量（瓶 + 水）质量再称量（瓶 + 空气）质量
C.
二氧化碳要多次收集，每次收集时不需将上次瓶中二氧化碳气体倒出
D.
每次称量（瓶 + 气体）质量时，必须使用同一台天平
【单选题】Drugs that still haven't been approved for human use shouldn't be .
A.
tested
B.
of benefit
C.
taken
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