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【单选题】
下列具有十字花冠,四强雄蕊的一组是( )A.
A五味子，天南星
B.
B菘蓝、
C.
C川芎、当归
D.
D蒲公英、
E.
E甘草、黄芪
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举一反三
【单选题】Which of the following is NOT true?
A.
During the past two centuries, 19 species of animals have disappeared in Australia.
B.
Life on Earth is about 3.5 million years old.
C.
By the end of this century about one million species could become extinct.
D.
At least 250 million species of animals and plants have lived on Earth.
【单选题】关于分支结构,以下选项中描述不正确的是
A.
if 语句中条件部分可以使用任何能够产生True和False的语句和函数
B.
二分支结构有一种紧凑形式,使用保留字if和elif实现
C.
多分支结构用于设置多个判断条件以及对应的多条执行路径
D.
if 语句中语句块执行与否依赖于条件判断
【单选题】The teacher together with his assistants _____ ten cell samples during the past two months in the school lab.
A.
analyze
B.
analyzes
C.
has analyzed
D.
have analyzed
【单选题】以下关于分支结构的描述中,错误的是()
A.
if语句中语句块执行与否依赖于条件判断
B.
if语句中条件部分可以使用任何能够产生True和False的语句和函数
C.
双分支结构有一种紧凑形式,使用保留字if和elif实现
D.
多分支结构用于设置多个判断条件以及对应的多条执行路径
【简答题】How much has the carbon dioxide level in the atmosphere increased during the past two centuries?
【单选题】During the past two years, the ______ of automobile accidents in London City has decreased.
A.
proportion
B.
quantity
C.
amount
D.
number
【单选题】During the past two decades，research has______our knowledge of daydreaming.
A.
expanded
B.
emerged
C.
descended
D.
conquered
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