(
A. Africa
B. Asia
C. America
(
A. Two
B. Three
C. Four
(
A. make the soil weak
B. let the Sahara grow
C. be good for the soil
(
A. How to stop the desert growing
B. When to plant trees
C. When to leave homes
A
)1. The world's biggest desert is in ______.A. Africa
B. Asia
C. America
(
B
)2. ______ things make the soil weak according to the passage.A. Two
B. Three
C. Four
(
C
)3. Planting more trees can ______.A. make the soil weak
B. let the Sahara grow
C. be good for the soil
(
A
)4. ______ is a big problem.A. How to stop the desert growing
B. When to plant trees
C. When to leave homes
答案
1. A 2. B 3. C 4. A
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