填空题____
填空题
____
参考解析
解析：
by。考点:固定搭配。分析句子结构可知，该处缺少副词短语修饰动词discovered。该句句意为“制造商通过反复试验发现……”，而且短语by trial and error意为“通过反复试验”，符合句意，故答案为L项。
by。考点:固定搭配。分析句子结构可知，该处缺少副词短语修饰动词discovered。该句句意为“制造商通过反复试验发现……”，而且短语by trial and error意为“通过反复试验”，符合句意，故答案为L项。
相关考题：
单选题AShe blames the economic depression in the last five years.BShe insists that the government fulfilled its promise by lowering interest rates.CShe denies saying that before.DShe insists that they have fulfilled the goal.
单选题_____ to get a definition for this word!AHow it is difficultBhow difficult is itCHow difficult it isDIt is how difficult
单选题Several students were surprised to learn that instructors expect two to three hours of study for each hour _____ in class.AspendingBspentCto spendDto have spent
单选题Which of the italicized parts functions as an attribute（定语）?AThis is where Luxun once lived.BI don’t know where Luxun once lived.CWe haven’t yet settled the question where we are going to spend our summer vacation.DShe is going to live in Macao, where she has some close friends.
单选题AThey cause very few problems.BThey are easy to deal with.CThere aren’t many of them.DThey are friendly to people.
单选题When the farmers visited the city for the first time, they were _____ by its complicated traffic system.AevokedBbewilderedCdivertedDundermined
单选题Which of the following is NOT used by the author to stop the child’s crying at night?ALeaving the baby crying alone in a room unattended.BLetting the baby listen to the radio for the nursery.CFeeding the baby with some warm milk and beverage.DAllowing the child to sleep in an absence of noise.
单选题What can we learn from the passage?AA talk with other architects may annoy the one you have chosen.BIf your home is exclusive in your residence region, you cannot get along well with your neighbors.CYou should consider the issue of whether to move or to remodel from financial aspect.DYou will always take back the whole expense of remodeling when you sell the current home.
单选题AIncreasing government’s handouts to the poor.BGovernment’s creation of more jobs.CEncouraging people to find jobs themselves.DRelying on government relief.
单选题Which of the following prepositional phrases is an adverbial of comparison?AAs soon as Marie opened the door, the dog ran in.BAs long as you can keep away from them, you’re safe.CAs far as grammar is concerned, I have grasped it.DShe cooks as well as her mother does.
单选题_____, the nuclear power station reactor is dangerous.AAs it is efficientBas efficient it isCEfficient as it isDEfficient as is it
单选题The ball _____ two or three times before rolling down the slope.AswayedBbouncedChoppedDdarted
单选题She _____ that it was a trick to get her involved in the matter, for she knew them too well.AdoubtedBsuspectedCconceivedDconvinced
单选题AShe blames the economic depression in the last five years.BShe insists that the government fulfilled its promise by lowering interest rates.CShe denies saying that before.DShe insists that they have fulfilled the goal.
填空题____