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单项选择题

对于已经存在的室内污染源，应在摸清污染源特性及其对室内环境的影响方式的基础上，采用通风换气、撤出室内、封闭或隔离等措施，防止散发的污染物进入室内环境。

A．对
B．错
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单项选择题
Once a month, just after sunset, trucks fill an outdoor parking lot in Los Angeles, California．Some trucks sell all kinds of food. Others have clothing for sale. These are known as fashion（时尚）trucks.
It's really fun to go through everything in the truck. The back of the truck is a small store. Clothing hangs on one side. Jewelry（首饰）and purses are on the other. The store looks colorful and is well organized. There is also a very small room for trying on clothes.
Jordana Fortaleza is one of the truck owners. She says the cost of owning a truck is much lower than paying for a store. And there is another reason to use a truck. You can take your business to your customers. But there are also difficulties.
The biggest problem is the weather. In winter, it's cold outside and there's no one around. Another problem is keeping the truck in good condition. When it breaks down, the repairs can take days. Business stops during the time. It happens at least once a year because her truck is 38 years old．
Meagan Rogers is a fashion school graduate. She says the job market is so hard now, but with a fashion truck she's able to start earning money while her classmates are still working without pay.
What would be the best title for the text?（　　
A.TipsforRepairingYourTruck
B.HowtoStartaClothesStore
C.TheStoryofaFashionSchool
D.FashionTrucksinLosAngeles
单项选择题
除针入度能够表示沥青材料的条件粘度以外，同样属于条件粘度的指标是（）。
A.针入度指数
B.粘附性
C.延度
D.软化点
单项选择题
Once a month, just after sunset, trucks fill an outdoor parking lot in Los Angeles, California．Some trucks sell all kinds of food. Others have clothing for sale. These are known as fashion（时尚）trucks.
It's really fun to go through everything in the truck. The back of the truck is a small store. Clothing hangs on one side. Jewelry（首饰）and purses are on the other. The store looks colorful and is well organized. There is also a very small room for trying on clothes.
Jordana Fortaleza is one of the truck owners. She says the cost of owning a truck is much lower than paying for a store. And there is another reason to use a truck. You can take your business to your customers. But there are also difficulties.
The biggest problem is the weather. In winter, it's cold outside and there's no one around. Another problem is keeping the truck in good condition. When it breaks down, the repairs can take days. Business stops during the time. It happens at least once a year because her truck is 38 years old．
Meagan Rogers is a fashion school graduate. She says the job market is so hard now, but with a fashion truck she's able to start earning money while her classmates are still working without pay.
Which of the following is an advantage of a fashion truck?（　　
A.Itattractsmorecustomers
B.Itcostslessthanastore
C.Itneedsrepairsonceayear
D.Ithasasmallroominit
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