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CTBS Comprehensive Test of Basic Skills – VIP Practice Exam
CTBS — The Comprehensive Tests of Basic Skills (CTBS), published by CTB/McGraw-Hill (now DRC), is a norm-referenced standardized achievement assessment battery covering Reading, Language Arts, Mathematics, Science, and Social Studies across multiple grade levels (K–12); scores are reported as scale scores, grade equivalents, and national percentile ranks rather than a single pass mark — this VIP practice set targets upper-level (Grade 8–12 equivalent) content across all five domains at above-average difficulty.
31
Questions
90m
Time Limit
70.00%
To Pass
Question 1 of 31👑 VIP
Read the following passage and answer the question below. "The Amazon rainforest, often called the 'lungs of the Earth,' produces approximately 20% of the world's oxygen through photosynthesis. Covering roughly 5.5 million square kilometers, it spans nine countries, with Brazil containing about 60% of the forest. Between 2000 and 2020, the Amazon lost approximately 400,000 square kilometers of forest cover — an area larger than Germany. The causes are varied: cattle ranching accounts for approximately 70% of deforestation, followed by small-scale subsistence agriculture, large-scale commercial farming (particularly soybeans), logging, and infrastructure development. Scientists warn that if deforestation reaches a 'tipping point' — estimated at roughly 20–25% of original forest lost — the ecosystem could undergo irreversible 'savannization,' transforming from a humid rainforest into a drier savanna-type landscape. As of recent estimates, approximately 17% of the Amazon has already been deforested." According to the passage, what is the single largest cause of Amazon deforestation?
Questions 2–31 and full explanations are VIP-exclusive.