小麦茎秆的高矮由一对等位基因控制,一纯合显性亲本与一隐性亲本杂交产生F1,对其进行测交,测交后代中纯合子占的比例是[ ]
A.0
B.25%
C.50%
D.75%
答案:C
用动词的适当形式填空。
1. Tom, (not walk) on the grass.
2. The geese (catch)the fish now.
3. What this sign (mean) ?
4. His parents (go)to Beijing last week.
5. We like (play) football after school.
6. Look! The girls (dance)in the hall.
7. (be)there any money in your hand?
8. Who (have)got a boy-game? I (have)got one.
在各种促销手段中,最有利于建立和培养友好关系,而且及时获得买主反应的方式是()。
A.广告
B.营业推广
C.人员推销
D.公共关系