阅读下面短文，从短文后所给各题的四个选项（A、B、C、D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Dear Jane,
I'm pleased to receive your letter __21__ about information about China's high-speed trains and the Qingming Festival.
With the developing of China’s __22__, more and more high-speed railways are under __23__. There are several advantages for high-speed trains. The reasons are as follows:
First, it's more __24__ for us to go travelling by high-speed train, because they can run as fast as 350 kilometers per hour!
Second, you may find it's more comfortable when taking such a train, with more space for more passengers to sit __25__, and more security measures are taken to make it safer.
Further more, high-speed railways __26__ only half of the land as freeways need. At the same time they make less __27__ because they use less energy and make less noise!
Next I’ll __28__ you something about the Qingming Festival.
The Qingming Festival, also __29__ the Tomb-sweeping Day, coming __30__ April 5 every year, is one of the most important __31__ in China.
On this important day, people, often with a __32__ family, go to sweep their ancestor’s __33__. Meanwhile, they will __34__ sacrifices before the tombs to show their respect __35__ the deceased. At the same time, many people will present flowers and some other __36__ before the tombs of the martyrs in __37__ of their heroic deeds.
However, the Qingming Festival is also __38__ with happiness and joy when all the members of a family get __39__. Children are pleased when they are going hiking in the mountain, flying kites with their fellows, or having a big meal with their family members who have been __40__ for a long time!
I'm looking forward to your letter.
Best wishes.
Yours
Li Hua

A．asked B．asking C．to ask D．ask

A．economy B．inspiration C．industry D．agriculture

A．pressure B．discussion C．consideration D．construction

A．comfortable B．mysterious C．convenient D．eager

A．on B．in C．at D．out

A．cover B．take in C．look up D．stare at

A．dust B．effect C．advantage D．pollution

A．look for B．introduce C．judge D．go through

A．called B．saw C．calling D．seeing

A．on B．around C．in D．out of

A．days B．inventions C．festivals D．preparations

A．all B．single C．whole D．frightened

A．tombs B．houses C．buildings D．mountains

A．send B．cut in C．clear D．provide

A．for B．to C．at D．from

A．roses B．rice C．items D．pieces

A．front B．case C．heart D．memory

A．filled B．full C．covered D．shortened

A．in B．together C．away D．up

A．parted B．party C．parting D．apart