Why is a Walden reductor always used whit solutions that contain appreciable concentrations of HCl？

Why did the professor mention Walden？

A．It is probably well-known to many of the students in the class.

B．It is considered an excellent example of Transcendental literature.

C．It is required reading for the course that She is teaching.

D．It is her personal favorite of nineteenth-century essays.

The writer of Walden is Henry David Thoreau.()

What is Zhao's attitude toward climate change？

A．It is mainly an issue of CO2 emission reduction.

B．It is a challenge involving no cultural issues.

C．It is linked closely with population.

D．It is the responsibility of the developed countries to solve it.

根据材料请回答 31～35 题:

第 31 题 The report says that steps could be taken to reduce about

Walden, or Life in the Woods is the masterpiece of______.

A．Ralph Waldo Emerson

B．Walt Whitman

C．Washington Irving

D．Henry David Thoreau

The best title for this passage would be ______.

A．Life at Walden Pond

B．Walden, Thoreau's Greatest Work

C．Thoreau's System of Moral Behavior

D．Thoreau's Theory of the Good Life

According to this passage, which of the following is NOT TRUE？

A.Many girls decide to reduce effort in the study of mathematics as social pressure increases.

B.More women drop out of mathematics than men beyond the bachelor s degree.

C.Women tend to prefer the majors such as psychology, biology, and sociology.

D.Womens less interest in mathematics limits their access to some careers.

Walden was written by

A．Henry David Thoreau.

B．Ralph Waldo Emerson.

C．Henry Wadsworth Longfellow.

D．James Russell Lowell.