阅读理解。
Here's how you can take the taxi in Japan. From train stations or airports, go to the taxi stand
and line up.
In the street, look for a taxi that has a red light in the front window. It indicates the taxi is empty.
(If the light is green, the taxi has passengers.) When you see, an empty taxi, raise your hand and call
it. The back door opens and closes automatically, so stand back and wait until it opens. Get in the taxi
and tell the driver your destination or show him or her the Japanese written address of your destination.
Before you get out of the taxi, pay the charge indicated on the meter. No tip is necessary. Wait until
the door opens and get out of the taxi.
1. If you want to take a taxi, you should _______ after you come out of the airport.
A. go to the bus stop
B. wait in the street
C. raise your hands and call the taxi
D. go to the taxi stand and wait there
2. When _______, raise your hand and call".
A. you see a car with the "taxi" sign
B. you see an empty taxi
C. a taxi is waiting for you
D. you find a taxi with a green light on
3. Before you get in the taxi, you should _______.
A. open the front door
B. open the back door
C. wait until the front door opens
D. wait until the back door opens
ZrCl4+SiCl4+4CO
ZrO2+2HCl↑+7H2O↑