计算231×3时,2×3得6个( ),3×3得( )个( ),1×3得( )个( ),结果是( )。
100,9,10,3,1,693
胚芽鞘产生生长素部位,感受单侧光刺激部位和弯曲生长部位分别是[ ]
A.尖端、尖端、尖端
B.尖端、尖端、尖端下面的部分
C.尖端、尖端下面的部分、尖端下面的部分
D.尖端、尖端下面部分、尖端
The use of Chinese by teachers in ______ English classroom must be restricted because it will decrease _______ time when students are exposed to the English language.
A.the; /
B.an; /
C./; the
D.an; the