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破伤风痉挛毒素能阻止抑制性神经递质的释放。（ ）

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 do we know about Meagan Rogers?（　　）
A.Shehasstartedmakingmoney
B.Shehasn'tfinishedherschool
C.Sheishappytohelpherclassmates
D.Shehasproblemswithhertruck
判断题
Pessimism was steadily intensified in Charles Dickens’ second period of writing career, during which, his naïve optimism toward the capitalist society was profoundly shaken.  
单项选择题
I am watching my son and hundreds of his classmates, marching in perfect order into the university football stadium（体育场）. Holding back my tears, I search for my son in the sea of people. Suddenly, there he is. I jump to my feet and start waving. Arms flying back and forth above my head, l look like a windmill（风车）, or maybe an airport worker guiding a plane. I see him smile, then laugh as he pulls his camera out of his pocket. He takes a picture of me as he waves back, and then goes to find his seat.
What is it about graduations that makes them so moving? Why do most of us women cry as we watch our sons, daughters, grandchildren, nieces , and nephews march in dark robes（长袍）? We cry partly because, no matter how old our children are, and no matter how much they have achieved, in our eyes they are still the little babies we carry around the house to comfort.
And, of course, we cry also because something wonderful is ending, and we miss it already. Whatever is on its way to take its place will not be the same. It has been such a gift to have my son go to college close to home. We never have to worry about whether he will be able to make the trip home for a holiday. But this was a time-limited gift. My son will attend graduate school in California. We will talk and text like crazy, and visit as often as we can. But it will not be the same.
What will be different when the son attends graduate school?（　　
A.Hewillspendholidaysathome
B.Hewillnotcallhismomsooften
C.Hewillbefarawayfromhome
D.Hewillnotgivehismomanygift
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