The problem Howe was trying to solve was______.
A. what kind of thread to use
B. how to design a needle which would not break
C. where to put the needle
D. how to get the thread to run smoothly around the needle
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I was just about to speak______Jack stood up and began his long speech.
A. while
B. when
C. however
D. and
It is the ability to do the job______matters not where you come from or what you are.
A. which
B. that
C. what
D. it
On the whole, we can conclude______.
A. people in Beijing prefer modern culture to something traditional
B. there are usually more culture activities in September than in any other month
C. most of the cultural activities in Beijing are for foreign visitors only
D. we can enjoy a large variety of cultural activities in Beijing
因为在减数分裂I中，同源染色体成对随机地排列在中期赤道板上，所以通常不同染色体上的基因相互独立地进入配子。
A. 正确
B. 错误
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