2008年奥运会期间,游客可以在北京地区实地考察到下列哪种古人类遗址?[ ]
A.元谋人遗址
B.北京人遗址
C.河姆渡人遗址
D.半坡人遗址
答案:B
用适当的介词或副词填空。
up high down on to with
1. Jack is a strong (强壮的) boy. He can jump ____.
2. Lift ____ your left leg.
3.I often go to school ____ foot.
4. Can you play chess ____ me?
5. We are trying ____ follow the old man's orders.
6. Bend ____.
关于噬菌体生物学特性叙述错误的是
A.是细菌的病毒
B.不具有抗原性
C.主要成分是核酸和蛋白质
D.形态多呈蝌蚪状
E.较细菌的抵抗力强