_____into his past.
A. probing B. getting C. breaking D. coming
[14].
【参考答案】：A
15. Those great, imaginative thinkers looked deeply into the natural world, toward the very _____of life.
A. truth B. principle C. meaning D. essence
[15].
【参考答案】：D
16. Obama, however, continued to ______ a public campaign to press Republicans to pass his plan.
A. push over B. push to C. push for/strive for D. push in
[16].
【参考答案】：C
17. You’d better let me know as soon as there is a(n)____position in the branch office.
A. empty B. vacuum cleaner C. hollow D. vacant
[17].
【参考答案】：D
18. The company is facing a ______challenge in the next round of competition in the world market.
A. flexible B. consistent C. firm D. stiff
[18].
【参考答案】：D
19. A control over the population is _____to the sustainable development of China.
A. decisive B. crucial C. efficient D. offensive
[19].
【参考答案】：B
20. We take our skin for granted until it is burned ________ repair.
A. beyond B. for C. without D. under
[20].
