In discussing Landes's work, the author's tone is ______.
A. matter-of-fact
B. skeptical
C. reproachful
D. enthusiastic
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函数y=x3-3x的单调递减区间为（）。
A. （-∞，-1]
B. [-1，1]
C. [1，+∞）
D. （-∞，+∞）
Utopia is the work of ______
A. Spenser
B. Donne
C. Blake
D. More
The author suggests that implementing manufacturing competitiveness is a strategy that is ______.
A. flawed and ruinous
B. shortsighted and difficult to sustain
C. popular and easily accomplished
D. useful but inadequate
防治住宅工程附墙烟道堵塞、串烟时，推广采用( )提芯工具的施工方法，既可防止杂物落人烟道内造成堵塞，又可使烟道内壁砂浆光滑、密实，对防止串烟有利。
A. 箱式
B. 柱式
C. 桶式
D. 板式
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