题目内容

When was DDT invented?

A. 1974
B. 1874
C. 1878
D. 1978

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Which of the following books was written by Charles Darwin?

A. The Sea Around Us
B. The Edge of the Sea
C. The Origin of Species
D. Slilent Spring

Rachel Carson decided that she wanted to be a writer when.

A. she was very young
B. she was in college
C. she became a teacher
D. she became famous

Silent Spring is a book in which the author calls for man's attention to the protection of the environment as well as the human beings themselves.

A. 对
B. 错

砂浆沉入度值越大，表示新拌砂浆的流动性。（填“越大”或“越小”）