[题目] scientists have learned a lot about the universe, there is much we still don't know.A. Once B. SinceC. Though D. Unless 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】 ______ scientists have learned a lot about the universe, there is much we still don't know.

A. Once B. Since

C. Though D. Unless

【答案】C

【解析】试题分析：句意：虽然科学家已经了解到很多有关宇宙的知识，但是，我们仍然不知道的还有很多。A一旦；B既然，自从；C虽然；D除非。once和unless表示条件，since表示原因或时间；though表示让步或转折。这里是转折含义，故选C。

练习册系列答案

注意：1.文章的开头已经写好，不计入总词数；2.词数120左右；3.适当发挥使文章连贯。

Some senior middle school graduates have different opinions on how to choose their majors and universities.

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【题目】 Broad Band: by Claire L. Evans. Portfolio，2018 ($27)

Though often outnumbered by men，women stayed in the booming field of computing. In this inspiring tale，writer Evans records the contributions of some of the many women who aided the rise of the modern Internet.

Memorable characters include Elizabeth "Jake" Feinler, an information scientist who helped researchers navigate the Arpane and Stacy Horn，who started one of the first social networks，Echo.

The Wizard and the Prophet: by Charles C. Mann. Knopf，2018( $28.95) The human population is moving toward 10 billion --- some experts think we'll nearly hit that mark by 2050. How will the earth feed，house and otherwise support such a crowd? Environmental thinkers usually fall into one of two camps: those who prefer conservation and controlling consumption，like William Vogt，and those who trust innovation to solve our problems, Norman Borlaug, for example. Writer Mann carefully records the lives and thought of the founders of these two philosophies.

A Lab of One's Own: by Patricia Fara. Oxford University Ptess，2018( $24.95)

In World War I many women in the U.K. replaced their aprons with chemical suits and stepped into previously male-only fields of science, where they led war research efforts. Science historian Fara illustrates the lives of many of these forgotten women. Although the era marked a major step forward for women scientists, many worked for small wages in an environment of discrimination.

In the nearly 100 years since, women have come a long way, Fara writes, but the glass ceilings remain solid and the pipelines leaky.

Atom Land: by Jon Butterworth. The Experiment，2018( $19.95)

Butterworth takes readers on an amusing journey through the unknown world of particle (粒子) physics. The first stop is "Atom Land，" where Butterworth explains how electrons，protons and neutrons come together to build up everything we know. As the journey unfolds，we learn about lesser-known particles. Thankfully, our ship is equipped with tools such as mathematical equations（方程式）and a "laser light" that lights up the darkest of concepts.

【1】Who focuses on the future of our earth?

A. Claire L. Evans.B. Charles

C. Mann. C. Patricia Fara.D. Jon Butterworth.

【2】Which books will you probably read if you are interested in women's career?

A. Broad Band & Atom Land.

B. The Wizard and the Prophet & Atom Land.

C. Broad Band & A Lab of One's Own.

D. A Lab of One's Own & Atom Land.

【3】What's the purpose of writing the passages above?

A. To clarify some concepts.

B. To introduce some famous writers.

C. To make comments on some books.