用“ if ” 把下列句子连接起来。

1. I will go the park tomorrow.  I have time. 

2. They stay in the desert.  They will see the camels.

3. Tigers are in danger.  They attack people.

4. Elephants are thirsty.  They go to the river.

5. Giant pandas have no food.  They die.

十一届三中全会以后，成为中国对外开放的窗口和试验田的是

A．经济特区

B．沿海开放城市

C．沿海经济开放区

D．设立海南省，将其划为经济特区