Malaria, it is true, has been practically ______ in thirteen countries, including the United States, and is under attack in many others.
A. wiped out
B. died out
C. put out
D. kept out
查看答案
All of the following pairs of sounds except ______ are distinguished from each other by the feature "+voiced".
A. /p/ and /b/
B. /t/ and /d/
C. /k/ and /g/
D. /m/ and /n/
The reason some children are backward in speaking is that ______.
A. they are unable to learn language rapidly
B. their mothers are not clever about a child
C. their mothers respond inadequately to their attempts to speak
D. they are exposed to too much language at once
According to Stouffer, why were GIs much more friendly towards their officers in combat
A. Because they were afraid of being assigned dangerous tasks.
Because they could release their pent-up frustration against the enemy.
C. Because they were more like equals and friends in face of enemy.
D. All of the abov
沥青碎石的常用厚度为( )mm。
A. 20～40
B. 50～70
C. 60～70
D. 40～50
微信支付 
支付宝支付