关于地球内部圈层的说法，正确的是
| A．厚度最大圈层是地幔，厚度最小圈层是地壳 |
| B．岩石圈由地壳和上地幔组成 |
| C．地幔位于古登堡界面以下，莫霍界面以上 |
| D．地震波中的纵波能够通过地球内部的所有圈层，横波则不能 |
Some famous singers live on the _________ from their record sales.
| A．salary | B．value | C．bill | D．income |
The World Trade Organization (WTO) finally opened its door to China on November 10, ______ our Chinese 15-year wait.
| A．to end | B．ended |
| C．ending | D．ends |
Qingdao is _______ most beautiful coastal city and I think I’ll go there for _______ second time.
| A．a;a | B．the; a | C．the; the | D．the; a |
A beach house caught fire last night, ______seven students living in it.
| A．to kill | B．killing | C．having killed | D．killed |
____the sketch of Xiao Shenyang made a _____has been known to us all.
| A．That; hit | B．What; strike | C．Why; beat | D．which; knock |