压缩气筒行最大静水压受力试验，一般规定几年一次（） A.3年 B.4年 C.5年 D

下列离子或分子组中能大量共存，且满足相应要求的是[ ]

( )是工程验收的最小单位。

A．检验批

B．分项工程

C．分部工程

D．单位工程

第一次世界大战中英军受次使用了新式武器（如图）这种新式武器采用当时最先进的科技成果有

① 煤炭的广泛应用 ② 内燃机的发明与制造 ③ 炼钢技术的突破 ④ 石油的广泛运用 ⑤ 蒸汽机的改进与运用 ⑥ 炼铁技术的进步

A ①②③  B ④⑤⑥  C ②③④  D ①③⑥

阅读理解。

    Andy was still traveling in Spain when he realized he had to confirm (确认) his flight home with the airline

company (航空公司). He was visiting Spain in order to improve his Spanish. When he was speaking to people

face to face, he had no difficulty understanding what they said. However, when he was speaking on the phone,

he still had a problem. Andy called the airline. And the clerk confirmed that his plane was leaving at nine o'clock

three days from that day. She also told Andy to be at the airport two hours earlier in order to check in his

luggage and get a seat.

    Since he was leaving in three days, Andy didn't lose any time. He visited as many places as he could. He

thought that it would probably be a while before he had enough money again. He wished he could come back

and spend a year in Spain.

    Too quickly, the final day arrived. Andy left early for the airport to arrive two hours before take-off. He

hated to rush. He went to the clerk to show his ticket. The clerk looked at the ticket in surprise. "Why, sir, but

your flight was at nine o'clock in the morning, and now it is eight in the evening." "But I confirmed my flight,"

insisted Andy. "Will I have to pay for another ticket?" 

    "No, sir. However, the next flight out will be three days from now." 

    Andy's look of shock turned to pleasure as he realized that now he could continue his vacation.

1. Why was Andy in Spain?[ ]

A. He was there on a business trip.

B. He hoped to learn Spanish better.

C. He liked to visit places of interest in Spain.

D. He was visiting friends there

2. Andy missed his flight because _____.[ ]

A. he forgot his flight time

B. the clerk gave him the wrong time of his flight

C. the clerk misunderstood him

D. he misunderstood the clerk

3. Which word can best describe the feeling of Andy when he came to know that his stay in Spain would

    be longer? [ ]

A. happy

B. shocked

C. upset

D. angry

4. What can we infer from the passage? [ ]

A. Travellers always have to confirm the time of flight with airline companies by phone call.

B. It's more difficult for Andy to understand others in Spanish face to face than on the phone.

C. Andy was enjoying himself when visiting places in Spain.

D. Andy would spend the next three days at the airport.

已知某地区某年的国民经济统计资料，如表2-3所示。
表2-3 单位：亿元

最终消费率为( )。