1 1, and draw the function diagram of |f(x)|. The image consists of two curves. In the left half plane, it is defined as f(x)=x? -2x, including the origin. The right half plane consists of f(x)=ln(x+ 1).

Obviously, there must be a≤0 in the function |f(x)|-ax≥0, because for any y=ax+k, as long as a >；; 0，x→∞，

There must be ax+k & gt；; Ln(x+b), which can be proved by derivative knowledge, was exposed to relevant content in high school.

Exclude options b and C.

Let a=-3, and then substitute it, we can see that when x ≤- 1, there is ax>x? -2x, so a=-3 is not suitable, and A is excluded.

So the answer is d.

The detailed calculation process is estimated to require more than half of A4 paper, or more.

Generally speaking, the multiple-choice questions in the college entrance examination are very skillful. If you directly substitute this question (a=-3 and a= 1 respectively), you should be able to get the answer within 1 minute. If the detailed answer proves that it will take about 10 minutes. There is no need to spend so much time.

8. Your photo is wrong. I checked the related questions.

It turned out to be an object with a horizontal semi-cylinder above and a cuboid below.

The upper half cylinder has a height of 2, a diameter of 4 and a volume of 2×2. π=8π

The cuboid in the lower half has a length and width of 4, a height of 2 and a volume of 4×4×2= 16.

So the total volume is 16+8π.