—I think a rabbit is a good pet for ______ 5-year-old child like Vera.
—Really? I don't think so.
[ ]
A. an
B. a
C. /
D. the
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| 任务型读写 阅读短文,根据所读内容在文章后表格中填入最恰当的单词,每空限填一词. People traveling long distances frequently have to decide whether they would prefer to go by land, sea or air. Hardly anyone can positively enjoy sitting in a train for more than a few hours. Train carriages soon get full of passengers and stuffy. It is almost impossible to take your mind off the journey. Reading is only a partial solution, for the noise of the wheels clicking on the rails soon makes you sleepy. During the day, sleep comes in short periods. At night, when you really want to go to sleep, you can rarely manage to do so. Surely you arrive at your destination almost worn out. Long car journeys are even less pleasant, for it is quite impossible even to read. On motorways you can, at least, travel fairly safely at high speeds, but more often than not, the greater part of the journey is spent on roads with few service stations and too much traffic. By comparison, ferry trips or cruises offer a great variety of civilized comforts. You can stretch your legs on the spacious decks, play games, meet interesting people and enjoy delicious food-always assuming, of course, that the sea is calm. If it is not, and you are likely to get seasick, no form of transport could be worse. Even if you travel in ideal weather, sea journeys take a long time. Airplanes have the reputation of being unsafe and even hardened travelers are afraid of them. They also have the disadvantages of being an expensive form of transport. But nothing can match them for speed and comfort. Traveling at a height of 30,000 feet, far above the clouds, and at over 500 miles an hour is a very exciting experience. You do not have to think out ways of taking your mind off the journey, for an airplane gets you to your destination rapidly. For a few hours, you settle back in a deep armchair to enjoy the flight. The real enjoyment is to watch a film and drink wine on some services. But even when these things are not available, there is plenty to keep you occupied. A plane offers you an unusual and breathtaking view of the world. The journey is so smooth that there is nothing to prevent you from reading or sleeping. No matter how you decide to spend your time, one thing is certain: you will arrive at your destination fresh and energetic. You do not have to spend the next few days recovering from a long and arduous journey.
|
关于G蛋白耦联受体的结构，叙述正确的是（）
A.必须与G蛋白结合才能产生信号传导效应
B.通常含7段疏水性跨膜序列
C.主要是结合生长因子的受体
D.N端位于胞内，而C端暴露在胞外
E.具有酪氨酸激酶活性
声像图表现为“镶嵌样”结构的实性占位性病变一般是指（）
A.原发性肝癌
B.肝转移癌
C.肝腺癌
D.肝脂肪癌
E.肝局灶性结节增生
公安机关人民警察内务建设的原则是高效务实、加强监督、( )。
A．着眼基层
B．实事求是
C．与时俱进
D．严格要求
某房地产公司出售一幢已办理竣工结算的商用写字楼，获得2000万元。根据税收法律制度的有关规定，下列各税中，属于该公司此项售楼业务应缴纳的税种有( )。
A．契税
B．营业税
C．印花税
D．土地增值税