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B. In an office.
C. In a French class.
B. Two.
C. Three.
B. Two days.
C. Three days.
B. Because the boy has to go to French classes.
C. Because neither of them is free.
(1)应用胚胎工程技术可以培育出“试管牛”。试管牛的培育需经过体外受精、 、
以及在母体中发育和产出等过程。
(2)在“试管牛”的培育过程中,要使精子和卵母细胞在体外成功结合,需要对精子进行处理,使其 。另外,培养的卵母细胞需要发育至减数第二次分裂的中期,该时期在显微镜下可观察到次级卵母细胞和 。
(3)通常奶牛每次排出一枚卵母细胞,采用激素处理可使其一次排出多枚卵母细胞,常使用的激素是 。
(4)利用基因工程可以获得转基因牛,从而改良奶牛的某些性状。基因工程的四个基本操作步骤是 、基因表达载体的构建、 和 。若要获得的转基因牛分泌的乳汁中含有人干扰素,则所构建的基因表达载体必须包括:某种牛乳腺分泌蛋白基因及其启动子、 、 、 和复制原点等。将该基因表达载体导入受体细胞所采用的方法是 (显微注射法、农杆菌转化法),为获得能大量产生人干扰素的转基因牛,该基因表达载体应导入的受体细胞是 (受精卵、乳腺细胞)。 查看习题详情和答案>>
Are two holidays not enough? Do you dream of three, or even four? 【小题1】这不再是梦想! Last month, the State Council(国务院) encouraged primary and high schools to give students a spring or autumn break without changing the total number of student vacation days.
Students in China currently only have long holidays in two seasons —summer and winter. These holidays are usually 10 to 12 weeks in total.“If we had spring and autumn breaks, 【小题2】I would have time to taste all four seasons instead of burying (埋) myself in my studies,”Gao Yiran, a 15-year-old boy told China Daily. Seasonal holidays during autumn and spring may be something new in China, but not in other countries.
In the US, students usually have three holidays. Summer holiday is the longest one, and runs from mid-June until early September. Summer camp is one of kids’ favorite places to go to, where they can make new friends and try some new activities. Winter holiday starts from mid-December and ends in early January. Most kids and their parents go to spend time together over the Christmas period. Spring break comes in mid- March and 【小题3】it is usually a 10-day holiday.
Schools in Japan start in April, as most people think that spring is the perfect time for new things. For school children ,summer holiday lasts from July 20 to August 31. Most kids are busy with club activities including sports and dancing. Spring break starts at the end of March and continues till early April. It is a good chance for a short family trip around the city.
阅读短文,按要求完成下面的任务。
任务一 将【小题4】处的中文翻译成英文。
任务二 将【小题5】处斜体部分的英文翻译成中文。
任务三 写出【小题6】处“it”指代的内容。
任务四 【小题7】What do Japanese kids usually do in their spring break?
任务五 【小题8】为该文段拟写一个标题。
--My parents and I will go to the library tomorrow.
--_______________. Shall we go together?
A. So am I B. So do I C. So I am D. So will I
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--My mother and I will go to Shanghai this summer.
---______. Shall we go together?
| A.So do I | B.So can I | C.So am I | D.So will I |