Don't you know ________ boy under the tree? He's our teacher's son.
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There is U andS in the word BUS.
A. an; a
B. a; an
C. an; an
D. the; the
Obama, ______President of the USA , made a speech on TV last night.
A. /
B. a
C. the
D. an
Whatfine weather we have these days!
A. an
B. a
C. /
D. the
玉米苗期丰产长势长相是:地上部高度增长较慢,没有病虫害。
A. 叶宽厚而浓绿
B. 根系发达
C. 地上部高度增长较慢,没有病虫害
D. 茎基发扁,植株墩实,壮而不旺