如果背景色和前景色不是默认的黑色和白色可按键盘的哪个键将其恢复为默认前景色和背景色（ 发布时间：2018-08-13 17:59 │ 来源：www.tikuol.com 题型：单项选择题 问题： 如果背景色和前景色不是默认的黑色和白色可按键盘的哪个键将其恢复为默认前景色和背景色（）A.DB.HC.LD.E
题型：单项选择题 完形填空。 Ten-year-old Johnny was one of the laziest boys in his class. His homework was always 1 and it was usually wrong. He only did half the number of math problems 2 the other children did and in his compositions he 3 half the number of words. And usually the words were 4 spelled because he was too lazy to use a 5 . One day his class went on a bus trip. The 6 did not want to take Johnny with them. But there was no one to look after Johnny at the school so she had to take 7 . "Now, children," the teacher said, "On our bus trip we will 8 old buildings, some beautiful countryside, and many other things. I want you to write about 9 interesting you see on the trip." The bus trip 10 . The children looked out of the windows at all the interesting things. They took notes 11 their notebooks. The teacher was very 12 with them. Then she saw Johnny 13 on the floor of the bus and went up to him. "Are you 14 ?" she asked him. "No." he said. "Then 15 are you lying on the floor?" "If I can't see anything," he said, "I can't write about it, can I?" ( )1. A. late ( )2. A. that ( )3. A. learned ( )4. A. badly ( )5. A. radio ( )6. A. driver ( )7. A. him ( )8. A. hear ( )9. A. nothing ( )10. A. ended ( )11. A. over ( )12. A. angry ( )13. A. standing ( )14. A. busy ( )15. A. where B. early B. who B. made B. well B. pen B. mother B. himself B. listen to B. something B. began B. by B. pleased B. sitting B. sick B. what C. good C. what C. wrote C. correctly C. library C. father C. his C. see C. nobody C. finished C. in C. patient C. eating C. happy C. how D. fine D. whom D. read D. nicely D. dictionary D. teacher D. he D. feel D. everybody D. closed D. at D. careful D. lying D. glad D. why 查看答案
题型：单项选择题 取某花类生药粉末，加浓氨水碱化后，氯仿浸提数次，浸提液挥去溶剂后，残渣加发烟硝酸蒸干后加无水乙醇及氢氧化钾，显紫色。此花类生药为（）A.丁香B.西红花C.洋金花D.金银花E.红花 查看答案