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【单选题】
Which of the following, if true, would cast the MOST doubt on scientists' most recent explanation for the origin of the ocean's water?
A.
Meteorites contain only twice, and not ten times as much xenon as regular sea water.
B.
Local water from the solar nebula is found to contain as much xenon as meteorites.
C.
Water from the solar nebula contains less deuterium than was previously thought.
D.
Comets containing more than twice the amount of deuterium than was previously thought.
E.
More than twice as many meteorites as comets existed in the solar system at the time of the Earth's formation.
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举一反三
【单选题】在预防饮食安全方面做的不妥当的是( C )
A.
购买和食用定型包装食品时,要查看有无生产日期,保质期、生产单位
B.
餐具要卫生,要有自己的专用餐具
C.
在外就餐时,选择较为便宜的无证无照的“路边摊”
D.
养成良好的个人卫生
【判断题】客人来访,主人要表示欢迎,客人离开的时候,主人应该先伸手与客人握手,表示送别之意。
A.
正确
B.
错误
【单选题】将反应 Fe 2+ +Ag + Fe 3+ +Ag 组成原电池,下列哪种表示符号正确的是 ( ) A. ( - )Pt|Fe 2+ , Fe 3+ ||Ag + |Ag ( + ) B. ( - )Cu|Fe 2+ , Fe 3+ ||Ag + |Ag ( + ) C. ( - )Ag|Fe 2+ , Fe 3+ ||Ag + |Ag ( + ) D. ( - )Pt|Fe 2+ , Fe ...
A.
B.
C.
D.
D
【单选题】When you feel _________, you should go to see a doctor.
A.
sick
B.
safe
C.
Sad
【单选题】以下在预防饮食安全方面做的不妥当的是()
A.
购买和食用定型包装食品时,要查看有无生产日期,保质期、生产单位
B.
餐具要卫生,要有自己的专用餐具
C.
在外就餐时,选择较为便宜的无证无照的“路边摊”
D.
养成良好的个人卫生
【单选题】–I argued with my best friend. What should I do? –_______ you feel sad, you should write a letter and say sorry.
A.
But
B.
If
C.
So
D.
Unless
【单选题】The author suggests that if you feel angry at something offensive, you should ______.
A.
take it as normal reaction
B.
cover up your feelings
C.
try to control your anger
D.
not worry about what has made you angry
【简答题】●以下关于企业应用集成(EAI)的叙述中,错误的是(28) 。 (28) A. EAI包括企业内部与企业之间的集成 B.EAI是一种对象中间件 C.EAI能够实现不同系统的互操作 D.EAI需要首先解决数据和数据库的集成问题
【单选题】You should make (the other) fellow (to feel important), if you want to get along with him and have him (like) you, because that is (the way to do it).
A.
the other
B.
to feel important
C.
like
D.
the way to do it
【单选题】在预防饮食安全方面做的不妥当的是( )
A.
购买和食用定型包装食品时,要查看有无生产日期,保质期、生产单位
B.
餐具要卫生,要有自己的专用餐具
C.
在外就餐时,选择较为便宜的无证无营业执照等
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