下列属于大陆裂谷的是（）。
A、中央海岭裂谷；
B、东非裂谷；
C、红海裂谷。
参考答案：B
I think it must have been in the restaurant ________ we had our dinner ________ I lost my keys.[ ]
A. that; when
B. that; that
C. where; that
D. which; that
A．隧道技术
B．加密技术
C．入侵检测技术
D．身份证认证技术
