Several _______ new books were sold out last week。
A. of thousand
B. thousands
C. thousand of
D. thousand
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Tomorrow is my ________ birthday。
A. sixteen
B. sixteenth
C. the sixteenth
D. the sixteen
We have stayed at this school for _______ 。Which following choice is wrong?
A. two and a half years
B. two years and a half
C. two years and half a year
D. both A and B
Which ARE right?
A. 2009, June 25
B. 25th June, 2009
C. June 25, 2009
D. June 25st, 2009
下列化合物无光学活性的是
A. ClCH=C=CHCH3
B. CH3CH=C=CHCH3
ClCH=C=C(CH3)2
D. CH3-CH(Cl)-CH=CH2
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