题干

昆虫的两种变态发育方式的全过程可以分别用如图的部分内容表示.已知D为卵期,下列叙述正确的是(  )

A:蜻蜓的不完全变态发育过程可以表示为A→B→C

B:若用此图表示蜜蜂的完全变态发育过程,则B为蛹期,C为幼虫期

C:若用此图表示蝗虫的发育过程,则C对农作物的危害最大

D:若用此图表示家蚕的发育过程,为了提高蚕丝产量,应设法延长C时期

上一题 下一题 0.0难度 选择题 更新时间:2018-12-10 01:14:35

答案(点此获取答案解析)

C

同类题1

阅读理解

    He was a poet known for the nostalgia he describes in his poems. Now, it's time: for us to express our nostalgia for this great writer.

    On Dec 14, 2017, the famous Chinese poet Yu Guangzhong passed away in Taiwan. Born in 1928 in Nanjing, Jiangsu, Yu studied in Sichuan when he was young. At that time, he had showed great interest in Chinese poems and spent a lot of his free time trying writing poems himself. Then he managed to publish his first poem at the age of 20. A year later, Yu and his family moved to Taiwan. He lived and worked there until his death.

    Nostalgia is Yu's masterpiece in which he expresses his homesickness for the Chinese mainland when he was in Taiwan.

    Published in 1971, the poem remains highly popular among Chinese speakers worldwide. Even those who know little about literature are familiar with lines from the poem. The poem is included in Chinese high school textbooks.

    Besides his achievements in poetry, Yu was also a successful essay writer, critic and translator. He once translated English poet Siegfried Sassoon's poem In Me, Past, Present, Future Meet into Chinese. It is regarded as an accurate and powerful translation, in which the most famous line is “心有猛虎, 细嗅蔷薇” for “In me the tiger sniffs the rose”.

    Yu spent his whole life writing. “The reason why I stick to writing till today comes down to my passion for the Chinese language,” he once said in a 2015 interview. He then added that this passion was strengthened by his love for his mother and His motherland.

    Now, let's appreciate the poem Nostalgia.

When I was young,                    But later on,

Nostalgia was a tiny, tiny stamp.         Nostalgia was a low, low grave.

Me on this side,                      Me on this outside,

Mother on the other side.               And my mother was inside.

When I grew up,                     And at present,

Nostalgia was a narrow boat ticket.       Nostalgia becomes a shallow strait.

Me on this side,                       Me on this side,

Bride on the other side.                 Mainland on the other side.

同类题4

阅读材料,完成下列要求。

材料一:1798年,英国人口理论学家马尔萨斯在《人口论》一书中指出:人口增长速度快于食物供应的增长速度,将会导致食物不足,引起贫困、恶习等出现。他主张采用道德抑制(晚婚、节育等)、积极抑制(贫困、战争等)来使人口减少到和生活资料相平衡。马尔萨斯反对社会改革论,认为社会中的贫穷和罪恶并不是社会经济和政治制度造成的,而是人口规律作用的结果,只有保持财产私有制以及各人担负起养育自己孩子的责任,才能使人们自制,不至于生殖过多的子女。他竭力反对当时英国实行的济贫法,济贫法使不能独立维持家庭的人也将结婚生子。马克思指出马尔萨斯的《人口论》所以轰动一时,完全是由于党派利益引起的。英国的寡头政府认为它可以最有效的扑灭一切追求人类进步的热情,因而报以热情的喝彩。

——摘编自《马尔萨斯人口理论的评价与中国人口问题》

材料二:孙中山1924年在广州国立高等师范学校所作的演讲中指出:“百年之后,美国人口可加到十万万,多过我们人口两倍半。如果美国来征服中国,那么百年之后,十个美国人中只参杂四个中国人,中国人便要被美国人所同化。到了那个时候,中国不但是失去主权,要亡国,中国人并且要被他们民族所消灭,还要灭种。……中国现在的新青年,也有被马尔赛(萨)斯学说所染。”孙中山的这种人口思想的影响极为深远。

——摘编自《孙中山人口思想研究》等