题目

某同学在用锌片与稀硫酸反应制取氢气时，向反应器中加入少量Na2SO4固体(不考虑温 度变化)，则此时化学反应速率将 ( ) A．增大              B．减小              C．不变             D．无法确定 答案：CAndy was still traveling in Spain when he realized he had to confirm (确认) his flight home with the airline company. He was visiting Spain in order to 　1 his Spanish. When he was speaking to people 2　 he had no 3 understanding what they said.　 4 , when he was speaking on the phone, he 5 had a problem. Andy 6 the airline. And the clerk confirmed that his plane was leaving at nine o’clock three days from that day. She 7 told Andy to be at the airport two hours 8 in order to check in his luggage and get a seat. Since he was 　9 in three days, Andy didn’t 10 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 11 and spend a year in Spain. Too 12 , the final day arrived. Andy left early for the airport to arrive two hours before take-off. He hated to 13 .He went to the clerk to 14 his ticket. The clerk looked at the ticket with 15 .“Why, sir, but your flight was at nine o’clock in the morning, and 16 it is eight in the evening.” “But I confirmed my flight,” 17 Andy.“Will I have to pay for another ticket?” “No, sir. However, the next flight out will be three days from now.” Andy’s 18 of shock turned to one of 19 as he realized that now he could continue his 20 . 1.A.prepare　　 B.improve　　　　 C.enjoy　　　　　　 D.learn 2.A.slowly　 B.in public　　　　 C.in person　　　　 D.carefully 3.A.difficulty　　　 B.idea　　　　　 C.mistake　　　　 D.interest 4.A.Instead　　 B.Therefore　　　　 C.Meanwhile　　　　 D.However 5.A.even　　　　 B.just　　　　　 C.still　　　　　　 D.seldom 6.A.called　 B.liked　　　　　　 C.trusted　　　　 　 D.asked 7.A.again　　　 B.also　　　　　 C.only　　　　　 D.once 8.A.before　 B.earlier　　　　　 C.later　　　　　　 D.after 9.A.moving　 B.returning　　　　 C.staying　　　　 　 D.leaving 10.A.take　　　 B.have　　　　　 C.lose　　　　　 D.find 11.A.wait　　　 B.go home　　　　 C.stop　　　　　 D.come back 12.A.shortly　　 B.quickly　　　　 　 C.badly　　　　　　 D.early 13.A.speak　 B.go　　　　　　　　 C.rush　　　　　 D.delay 14.A.buy　　　　 B.present　　　　 　 C.order　　　　　　 D.provide 15.A.astonishment B.patience　　　　　 C.respect　　　　 　 D.delight 16.A.maybe　 B.so　　　　　　 　 C.here　　　　　 D.now 17.A.insisted　 B.apologized　　　　 C.replied　　　　 　 D.demanded 18.A.experiencee B.expression　　　　 C.look　　　　　 D.face 19.A.pleasure　 B.comfort　　　　 C.sadness　　　　 　 D.hopelessness 20.A.plan　　　　 B.flight　　　　　　 C.journey　　　　 　 D.vacation