“杂交水稻之父”袁隆平院士将野生水稻和普通水稻多次杂交,培育出高产的杂交水稻新品种,利用的原理是()。
A. 生态系统的多样性
B. 染色体的多样性
C. 基因的多样性
D. 细胞的多样性
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某单位职工24人中,有女性11人,已婚的有16人。在已婚的16人中有女性6人。问这个单位的未婚男性有多少人?()
A. 1
B. 3
C. 9
D. 12
It is suggested that a superhighway__________ between Nanning and Hanoi to strengthen the
A. is built
B. be built
C. built
D. will have been built
Rainfall.is the main__________of water supply in that area.
A. kind
B. sort
C. source
D. resource
Waitress:Yes,Sit,anything the matter?Customer:__________but this soup is too salty. Waitress:I‘m very sorry,Sir.I‘ll change it for you.
A. I ean,t stand it
B. Sorry to do it
C. I hate to compiain
D. Sorry to bother you