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【单选题】
( )是食品毒理学研究的主要方法和手段。A.
动物试验
B.
化学分析
C.
流行病学调查
D.
微生物试验系统
E.
人群观察
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皮皮学刷刷变学霸
举一反三
【单选题】Pass me one more pen, please. _____, only one here now. [ ]
A.
There are
B.
There is
C.
There be
D.
There were
【单选题】－Can you tell me how many colours ______ in a rainbow? －Seven. [ ]
A.
there are
B.
are there
C.
they are
D.
are they
【单选题】_______ a bottle of cola, a hamburger and some hot dogs on the table. [ ]
A.
There are
B.
There is
C.
There have
D.
There has
【单选题】— ________ there any American teachers in your school? —________ .
A.
Is; Yes, there are
B.
Are; Yes, there are
C.
Is; No, there isn’t
D.
Are; No, there isn’t
【单选题】----________ there any food for the drivers and passengers? ----Yes, __________.
A.
Are; there are
B.
Is; it is
C.
Are; they are
D.
Is; there is
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