四、解答题：本题共2小题，共28分。解答应写出文字说明、证明过程或演算步骤。J联国811.（本小题满分13分）解关于x的不等式ax²－(5a十3)x十15
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22. — Carol, have a nice bath and a sound sleep so that you will befor school tomorrow.- OK, dad!A. safeB. patientC. freshD. natural What makes you practice basketball so hard?—My coach's wordsme to do better.A. promiseB. warnC. driveD. suppose24. —-What should we do during the fire practice?When the alarm, we should run out of the teaching building at once.A. gives outB. goes offC. puts awayD. takes on25. If you don't know you can show your thanks to your teachers, try making some thank-you cards for them.A.howB. whyC. whatD. which26. Lingling met a land of magic and wonder while she a trip in Mount Jiuhua.A. takes B. will takeC. is taking D. was taking 27. — The boy is ready to help others and he always smiles- So he is very popular among his classmates.A. suddenlyB. drilyC. brightly D. seriously28. We can achieve our dreamwe don't give up hope in the face of difficulties.A.thoughB. as long asC. in order thatD. before29. Usually, soupat the end of the meal in traditional Chinese dining culture.A. served B. will serveC. was served D. is served30. —— The competition is too hard for me. I will certainly lose.. You should never say no before you try.A. Come onB. Forget itC. I'm sorry D. No wayVI.完形填空（共20小题；每小题1分，满分20分）阅读下面短文，从每小题所给的 A、B、C、D四个选项中选出可以填入空白处的最佳选项。AAs summer comes around, outdoor activities are getting more and more popular. One ofthem is bike riding, or biking. The biking craze (热潮) is now _ 31 through China.Wang Jing is a student from Hangzhou. She seldom exercised before_32 she didn'tlike sports much. But since her hometown hosted the Asian Games in 2023, her33_insports has grown a lot. She has realized the _ 34 of sports and is now a big fan of biking."I feel free and _ 35 _ whenever I ride," Wang said. “Biking allows me to experience thebeauty along the road and the world seems to 36 _,”’ she added. Wang is just one of thosewho are 37 in love with biking. In cities like Chengdu and Beijing, thousands of peoplehave started to join in the biking craze.Will the craze in China last for a long time? The answer is “Yes." Thanks to the craze, therehave been383 like group rides and bike festivals. These create a sense of communityamong bikers. They 39 road information, biking experience and sometimes even meals.3
15.（18分【解析】（1）物块在C点，由牛顿第二定律有F-mg=m1分R解得Uc=2m/s1分BC段光滑，故物块到达B点时，速度大小UB=uc=2m/s1分物块在传送带上运动时，由牛顿第二定律有μmg=ma，解得a=5m/s²1分根据运动学公式，有UBx加=0.4m
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