Scientists ____ thousands of chemicals before they decided on the right one in t
题型:不详难度:来源:
Scientists ____ thousands of chemicals before they decided on the right one in the end.A.tried out | B.found out | C.worked out | D.turned out |
|
答案
A |
解析
这题是词组辨析:try out试验 find out查明work out制定出、锻炼 turn out结果是,A符合句意:科学家试验了成千上万的药品才做出正确的决定。 |
举一反三
It’s obvious that the Beijing Olympic Games a great success. A.kept B.showed C proved D.remained |
Emergency line operators must always _____ calm and make sure that they get all the information they need to send help.A.grow | B.stay | C.appear | D.become |
|
—Excuse me, would you lower your voice or use your mobile phone outside? —Oh, sorry.I_______A.didn’t realize | B.don’t realize | C.haven’t realized | D.hadn’t realize |
|
Although Jane agrees with me on most points , there was one on which she was unwilling to .A.give out | B.give in | C.give away | D.give off |
|
They’re arguing on who, on earth, is known for the great discovery penicillin, an effective bacteria killer.A.making up | B.making into | C.made of | D.made from |
|
最新试题
热门考点