题目内容
【题目】Nothing can stop the Sandstorm ___________ more and more trees are planted．
A．unless B．if C．when D．while
【答案】A
【解析】
试题分析：句意：除非种越来越多的树，没有什么能阻止沙尘暴。A．unless除非；B．if如果；C．when当……的时候；D．while在……期间。据Nothing can stop the Sandstorm故选A。
【题目】We often use some warning signals to describe how serious a meteorological disaster(气象灾害) is . For example, let’s see how to describe the level of a snowstorm.
Warning signal | Meaning | Notice |
| It means the amount of snowfall reaches 4mm or more in 12 hours, or the snowfall continues when it gets to 4 mm. It may affect (影响) people’s daily life . | Fight against snowstorm; Work of sweeping and melting the snow; Be careful not to slide (滑倒). |
| The amount of snowfall reaches 6 mm or more in 12 hours, or the snow continues to fall after it gets to 6 mm. It may have effects on people’s daily life. | The same as the first notice. |
| The amount of snowfall reaches 10 mm or more in 6 hours, or it continues to fall after getting to 10 mm. It has a great effect on people’s life. | The same as the first notice and moreover, avoid unnecessary outdoor activities. |
| The amount of snowfall reaches 15 mm or more in 6 hours, or it continues to fall after getting to 15 mm. It has a very great effect on people’s life. | The same as the third notice. |
【1】Which of the four signals describe the most serious snowstorm?
A. The blue one.B. The yellow one.C. The orange one.D. The red one.
【2】If the amount of snowfall gets to 13 mm in 6 hours, the signal should be .
A. blueB. yellowC. orangeD. red
【3】The meaning of the underlined word “melting” may be “ ”.
A. 凝结B. 凝固C. 融化D. 熔化
【4】If the warning signal is red, which of the following things CANNOT Lucy do?
A. She is going to watch CCTV news about snowstorm at home.
B. She is going to take photos of snow in the front of her house.
C. She is going to draw a picture about snow in the field.
D. She is going to sleep in bed.
【5】Which of the following places may the signals come from?
A. The travelling department.B. The meteorological department.
C. The traffic department.D. The railway department.
