(
A. Four.
B. Five.
C. Six.
(
A. Mix salt in water.
B. Place the glass into the basin.
C. Move the solar still into the sun.
(
(
A. Stones.
B. Sunlight.
C. Pure water.
(
A. Science.
B. Geography.
C. Maths.
C
)1. How many things should you prepare?A. Four.
B. Five.
C. Six.
(
B
)2. What is the second step?A. Mix salt in water.
B. Place the glass into the basin.
C. Move the solar still into the sun.
(
A
)3. What is used to fix the plastic paper?(
C
)4. What is "?" in the glass?A. Stones.
B. Sunlight.
C. Pure water.
(
A
)5. In which subject will you probably read the passage?A. Science.
B. Geography.
C. Maths.
答案：1.C 2.B 3.A 4.C 5.A