“巨河之洲”是指( )
A.亚洲
B.欧洲
C.非洲
D.北美洲
“巨河之洲”是指亚洲,“巨河”是指长江.
故选:A.
单词拼写。
1. You shouldn't p_____ at anyone with your chopsticks.
2. You have to cut it up and eat with a f_____.
3. You aren't supposed to s_____ your chopsticks into your food.
4. It's very rude to say you're f_____.
在一所医院的300名吸烟男医师中,有100人自动戒烟,200人继续吸烟,研究者进行了20年的随访观察,以确定两组肺癌的发生与死亡情况,这种研究属于()
A.实验研究
B.病例对照研究
C.描述性研究
D.队列研究
E.理论性研究