在农业生产上，玉米的果穗常会出现缺粒现象。你分析产生这种现象的主要原因是 [ ]
A．传粉不足
B．水分不足
C．光照不足
D．遭受虫害
A
下列既可以用于配制一定质量分数的溶液，又可以用于加热较多液体的仪器是（ ）
A．试管
B．集气瓶
C．量筒
D．烧杯
看图完成对话，一空一词。
John: Hi, Tom! It's me. Don't you _ 1_ me?
Tom: Oh. hi, John. How are you?
John: Fine. Do you remember we _2_ to the West Lake last year?
Tom: Yes. You used to _3 _ boating, didn't you?
John: Yeah. You were more _4 _ in swimming.
Tom: But now I play soccer.
John: Wow!You sure _5 _ .
1.____ 2. 3.___ 4. ___ 5. ____
