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【单选题】
G/G易位型21.三体综合征，柒色体核型是A.
47 ,XX(或XY), +21
B.
46 ,XX(或XY),-22, +t(21q22q)
C.
46,xx（或XY)，-13,+t(13q21q)
D.
46,xx（或XY)，-14,+t(14q21q)
E.
46,xx（或XY)，- 15,+t( 15q21q)
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反馈参考答案：
举一反三
【简答题】已知等比数列{a n }中，a 6 ?a 7 =1，a 10 ?a 11 =16，则a 8 ?a 9 等于______．
【单选题】Mrs. Smith made her students _ the compositions three times a week.
A.
write
B.
to write
C.
written
D.
writing
【单选题】Students are required to write in a style _____to the subject when writing compositions.
A.
appropriate
B.
TRUE
C.
right
D.
correct
【简答题】My classmates are busy ( ) (write) compositions.
【简答题】Professor Wang had us (write) ______ compositions every Friday.
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