Scientists in the US have created a new strain of mosquito that’s resistant to malaria, meaning it can’t then pass the disease onto humans. But their release into the wild is several years away.
Scientists say this is a key step on a long journey towards fighting the disease with genetically modified mosquitoes. The researchers used a single genetic tweak to interfere with the production of a molecule in the insect’s gut. Previous studies have attempted a similar approach, but this is the first time that scientists have completely blocked the development of the malaria parasite inside the mosquito. This rendered the insect unable to spread the disease. The ultimate aim is to release these malaria-resistant mosquitoes into the wild, but scientists will first need to work on more genetic trickery to give their insects a competitive advantage over their disease-spreading counterparts.
You have to be careful not to be attracted by the variety of books in a bookshop. (36) is very easy to enter the shop looking (37) a book on, say, ancient coins and to come out carrying a copy of the (38) best-selling novel and perhaps a book about brass-robbing (39) which had only vaguely interested you up till then. This volume on the subject, however, (40) to be so well illustrated and the part of the text you read proved so interesting, (41) you just had to buy it. This sort of thing (42) be very dangerous. Apart from running up a huge account, you can (43) a great deal of time wandering from section to section. Book-sellers must be both long-suffering and indulgent.
There is a (44) which well illustrates this. A medical student had to read a text-book which was far too expensive for him to (45) . He couldn’t obtain it from the library and the only copy he could find was in his bookshop. (4
A. take
B. make
C. waste
D. save
| That cold January night, I was growing
sick of my life in San Francisco. There I was, walking home at one in the
morning after a tiring practice at the theater. With opening night only a week
away, I was still learning my lines. I was having trouble dealing with my
part-time job at the bank and my acting at night at the same time. As I walked,
I thought seriously about giving up both acting and San Francisco. City life bad
become too much for me. As I walked down empty streets under tall buildings, I felt very small and cold. I began running, both to keep warm and to keep away from any possible robbers (抢劫犯). Very few people were still out except a few sad-looking homeless people under blankets. About a block from my apartment (公寓房间), I heard a sound behind me: I turned quickly, half expecting to see someone with a knife or A. Cold and sick. B. Fortunate and hopeful. C. Satisfied and cheerful. D. Disappointed and helpless. [单选题]根据《房屋建筑与装饰工程工程量计算规范》GB50854—2013，关于刷喷涂料工程量计算，说法正确的是（ ）。
A.木材构件喷刷防火涂料按设计图示以面积计算 B.金属构件刷防火涂料按构件单面外围面积计算 C.空花格、栏杆刷涂料按设计图示尺寸以双面面积计算 D.线条刷涂料按设计展开面积计算 [单选题]使用试电笔验电时,手指应按在试电笔的( )。
A.顶部金属螺钉 B.笔杆中间 [填空题]门罩板上,红色灯是( )指示灯,黄色是( )指示灯。
[判断题]在电气原理图中,当触点图形垂直放置时,以“左开右闭”原则绘制。( )
A.正确 B.错误 [单项选择]单侧电源供电系统短路点的过渡电阻对距离保护的影响是（）
A. 使保护范围伸长； B. 使保护范围缩短； C. 保护范围不变； D. 保护范围不定。 [不定项选择]
某企业大批量生产一种产品，该企业为了安排下年度的年度、季度生产任务，现在进行生产能力核算工作。该企业全年制度工作日为250天，实行两班制工作模式，每班工作有效时间为7.5小时。车工车间共有车床20台，该车间单件产品时间定额为1小时；装配车间生产面积为120平方米，每件产品占用生产面积为3平方米，该车间单件产品时间定额为1.5小时。 该车工车间的年生产能力是（）件。A. 60000 B. 70000 C. 75000 D. 80000 [单选题]对于增值税一般纳税人取得走逃企业开具的异常增值税扣税凭证,下列处理错误的是:
A.在核实是否符合现行增值税进项税额抵扣相关规定前,尚未申报抵扣的,暂不允许抵扣 B.在核实是否符合现行增值税进项税额抵扣相关规定前,已经申报抵扣的,除另有规定外,一律先作进项税额转出 C.在核实是否符合现行增值税出口退税相关规定前,尚未申报出口退税的,可正常办理出口退税 D.经核实,符合现行增值税进项税额抵扣规定的,可继续申报抵扣 [多项选择]保障学生上下学交通安全是（）的共同责任
A. 政府； B. 学校； C. 社会； D. 家庭。 [判断题]待令工况时，35MPa、70MPa、105MPa通用压井管汇正常工况时压4 常开。
A.正确 B.错误 [判断题]《铁路旅客运输管理规则》规定，列车临时停车时严禁开车门乘凉、探身瞭望及清扫垃圾。
A.正确 B.错误 [单选题]根据资源税的有关规定，下列行为不需要缴纳资源税的是（ ）。
A.个体工商户在境内开采天然气 B.外商投资企业在境内开采煤炭 C.境内某企业销售外购的金属矿 D.境内某盐场销售生产的海盐 [判断题]个人二手住房贷款的贷款期限最长为40年。
A.正确 B.错误 [判断题]各季（冬季）施工钢结构防火涂料时，温度低于5℃时，应采取暖棚法施工。
A.正确 B.错误 [单项选择]紫外线照射消毒,每10—15平方米应有一支30瓦紫外灯，照射时间一般不少于（ ）。
A. 2小时 B. 4小时 C. 30分钟 D. 过夜 [单项选择]对从事接触职业病危害作业的劳动者，用人单位应当按照国务院卫生行政部门的规定组织（）的职业健康检查，并将检查结果如实告知劳动者。
A. 上岗前、在岗期间和离岗时 B. 上岗前和在岗期间 C. 在岗期间 [单项选择]Most parents, I suppose, have had the experience of reading a bedtime story to their children. And they must have (1) how difficult it is to write a (2) children’s book. Either the author has aimed too (3) , so that the children can’t follow what is in his(or more often, her) story, (4) the story seems to be talking to the readers.
The best children’s books are (5) very difficult nor very simple, and satisfy both the (6) who hears the story and the adult who reads it. Unfortunately, there are in fact (7) books like this, so the problem of finding the right bedtime story is not (8) to solve. This may be why many books regarded as (9) of children’s literature were in fact written for (10) . Alice’s Adventure in Wonderland is perhaps the most (11) of this. Children, left for themselves, often (12) the worst possible interest in literature. A. both B. neither C. either D. very [多选题]转炉双联法冶炼的优点主要有（ ）
A.提高生产效率 B.提高产品质量 C.降低成本 D.减轻环境污染 [单选题] 施工前( )日接到施工日计划后,由施工协调小组组长(副组长)组织施工协调小组成员及相关单位召开施工预备会,并做好会议记录。
A.1 B.2 C.3 D.5 [单选题]《安全生产法》立法的目的是为了加强安全生产监督管理,防止和减少(),保障人民群众生命和财产安全,促进经济发展。
A.生产安全事故 B.火灾、交通事故 C.重大、特大事故 D.人员伤亡事故 [单项选择]关于尿中结晶的说法正确的是（）
A. 尿中出现磺胺结晶提示有肝萎缩、磷中毒或白血病等 B. 亮氨酸和酪氨酸结晶出现于尿中，一般无临床意义 C. 胱氨酸结晶正常尿中少见，大量出现多见于肾或膀胱结石 D. 硫酸钙结晶为无色针状结晶，呈放射状排列，出现于新鲜尿液中有较大临床意义 E. 草酸钙结晶不属于正常的代谢成分 [单项选择]下列哪种措施对改善系统的精度没有效果（）。
A. 增加积分环节 B. 提高系统的开环增益K C. 增加微分环节 D. 引入扰动补偿 [判断题]作为一种风险测试方法，VaR考虑了交易头寸在期间内随市场变化的可能性。（）
A.正确 B.错误 [判断题]预算质询主要是以问题和答辩的方式在各业务负责人和企业领导间展开。（）
A.正确 B.错误 我来回答: 提交
|
